Purchase Orders & Supply Contracts for China: What Makes Them Enforceable

Most quality disputes with Chinese factories aren't really disputes about quality. They're disputes about what was agreed — and they're unwinnable because nothing usable was agreed in writing. The buyer says "these are wrong." The factory points at a vague one-line product description and says "these match what you ordered." Without a written spec and acceptance criteria, the factory is often technically correct.

This guide covers what a purchase order and supply contract for a China order need to contain: what makes them enforceable, and what makes a defect claim provable rather than arguable.

One thing up front: this is practitioner guidance from a sourcing operation, not legal advice. For bespoke contracts, high-value orders, or anything with unusual risk, have a China-qualified lawyer draft or review the documents.

Table of contents

1. Why an Alibaba chat log is not a contract
2. Purchase order vs supply agreement — two different documents
3. What makes a spec "contract-grade"
4. Governing law, language, and the company chop
5. Payment terms clauses
6. Remedies: the rework / reject / discount ladder
7. The PO and your NNN are separate documents
8. Mould ownership belongs in the contract
9. When Trade Assurance is enough instead
10. The bottom line

1. Why an Alibaba chat log is not a contract

New importers routinely believe they have a contract when what they actually have is a pile of messages: an Alibaba or WeChat thread, some emails, and a proforma invoice listing a product name, a quantity, and a price.

Chat messages aren't legally worthless — written exchanges can form part of a contractual record. But as a practical instrument for enforcing quality, a chat log fails on every axis:

The terms are scattered and contradictory. The colour was discussed on Tuesday, revised on Thursday, "confirmed" in a voice note. A chat log contains every version of the deal — and the factory will quote the version that favours them.

Nothing defines "acceptable." "Good quality" and "same as sample" aren't measurable. When units arrive with scratched surfaces, no written standard says whether that's a defect or normal.

The counterparty is unclear. You negotiated with "Cindy" on a sales account. Cindy is not a legal entity — and the company behind the account may be a trading company, not the factory, and not the entity you paid.

No remedies were agreed. Even if you prove the goods are wrong, nothing says what happens next — rework? refund? discount? You're negotiating from zero, after payment, with the goods already made.

A proforma invoice is slightly better — it names a price, a quantity, usually a legal entity — but it's a billing document, not a specification. Treat the chat as negotiation history and the PI as a price confirmation. The contract is a separate document you write deliberately.

2. Purchase order vs supply agreement — two different documents

Importers use "PO" and "contract" interchangeably. They're different instruments with different jobs:

A purchase order (PO) governs one order: the product (by reference to a spec), quantity, unit and total price, payment schedule, Incoterm, delivery date, and the acceptance criteria for this batch. It's issued per order and accepted by the supplier.

A supply agreement (framework agreement) governs the relationship — the terms that apply to every order with this supplier: governing law and dispute resolution, quality standards and inspection rights, defect remedies, IP and tooling ownership, subcontracting restrictions, termination. It's signed once and sits above the POs.

The efficient structure for repeat business is two-tier: sign a supply agreement once, then issue short POs under it, each stating that it's issued under the supply agreement dated such-and-such. For a genuine one-off you can collapse the two into a single order contract — but it then has to carry all the framework clauses itself, which is why a "simple PO" for a first order is rarely as simple as buyers hope.

Either way, the document must be signed (and chopped) by both parties. A PO you emailed and the factory never formally accepted is an offer, not an agreement.

3. What makes a spec "contract-grade"

The specification is the heart of the contract: it defines what conforming goods look like. Most specs fail because they describe the product the way a listing does, not the way an inspector needs. A contract-grade spec has these elements:

Dimensions with tolerances. Not "approximately 25cm" — a nominal dimension plus an explicit tolerance for every dimension that matters. If a dimension has no tolerance, you can't fail a unit on it; if it has one, an inspector with calipers can.

Materials by grade, not by name. "Stainless steel" spans a huge range of alloys; "cotton" says nothing about weight or weave. Specify the grade, the standard it should conform to, and where relevant the weight or thickness. If you can't name the grade, ask what the factory quoted — and write that down.

Colour by Pantone number. "Navy blue" is a negotiation; a Pantone reference is a measurement. Specify the code for every colour; if colour is commercially critical, require a pre-production colour sample for sign-off.

A packaging spec. Retail packaging artwork and material, unit packing, inner and master cartons, carton markings, and any marketplace-specific labelling. A large share of "quality" claims are actually packaging failures — crushed cartons, missing barcodes, wrong labels — and they're only claimable if packaging was specified.

AQL acceptance criteria written into the document. State the inspection standard, sampling level, and AQL limits for critical, major, and minor defects, and attach a defect classification list saying which defect counts as which. This converts "quality" from an adjective into a pass/fail test — see our AQL 2.5 inspection guide for the sampling maths. Crucially, the contract should say the goods must pass inspection at the stated AQL, not merely that an inspection will occur.

Labelled photos as exhibits. Attach photographs of the approved sample — overall views plus close-ups of details that matter — each labelled ("Exhibit A: stitching detail, rear seam") and referenced in the spec text. A photo of the golden sample, incorporated into the contract, ends a hundred arguments before they start. Keep the signed-off pre-production sample too, identified in the contract as the reference sample.

The test for the whole spec: could a third-party inspector who has never spoken to you decide pass/fail on every point without phoning you? If yes, it's contract-grade.

4. Governing law, language, and the company chop

This is where enforceability lives or dies. The logic mirrors the NNN agreement guide: a contract designed for a Western court is close to useless against a Chinese manufacturer.

Chinese governing law and jurisdiction. Your realistic enforcement venue against a Chinese factory is China. A contract under your home law, with your home courts, is generally impractical to enforce against a mainland supplier: you would win a judgment your Chinese counterparty's assets never feel. Specify PRC law and a Chinese court, or a recognised arbitration body. On arbitration, note that China has been a party to the New York Convention since 1987, so foreign-seated awards (HKIAC, SIAC, ICC) are enforceable in mainland China — a China-seated body is usually the simpler and cheaper path, not the only workable one.

Bilingual, with the Chinese version prevailing. Chinese courts work in Chinese; the Chinese text is what gets enforced. Draft in English and Chinese, state that the Chinese version prevails on any inconsistency, and have the translation done properly — you're agreeing to be bound by it. The worse alternative is signing English-only and letting a court-appointed translator decide later what you meant.

The registered Chinese legal name. The counterparty must be the supplier's registered Chinese legal entity — the characters on their business licence — not the English trading name on their Alibaba storefront. English names are marketing; the Chinese registered name is the entity. Verify it exists, is the one you think it is, and is actually the manufacturer rather than a shell — our 30-point supplier verification checklist covers checking the registration, business scope, and registered capital before you sign anything; the legal-representative check is covered in our NNN agreement guide.

The company chop. In China, the official company seal (chop) is what binds the company — it carries more weight than a signature. A contract signed by a salesperson without the chop is easy to disown later; a chopped contract is the company's act. Require the chop (ideally with the legal representative's signature alongside) and keep a high-resolution copy of the chopped pages.

Get these four right and you have a document a Chinese court can actually work with. Get any wrong and the drafting downstream may never be tested.

5. Payment terms clauses

The payment clause is your main practical leverage, so write it to preserve that leverage as long as possible.

The standard structure is deposit plus balance — commonly 30% to start production, 70% before shipment. The percentages are negotiable; the sequencing is the point.

Tie the balance to a passed inspection, not to a date. The most valuable sentence in the payment clause: the balance is payable only after the goods pass pre-shipment inspection against the AQL criteria in the specification. This connects your money to the spec in section 3. A clause saying "balance due before shipment" with no quality condition means you've agreed to pay for goods nobody has checked.

Name the bank account in the contract. State the supplier's receiving account and require any change to be confirmed through a separate verified channel. Payment-redirection fraud — a hijacked email announcing "new bank details" just before the balance is due — is one of the most common ways importers lose the entire order value; a contract-named account gives you a hard rule to refuse against.

Match the method to the risk. T/T against a chopped contract is the workhorse; letters of credit make sense at larger values. Our guide to paying Chinese suppliers compares the methods — the contract should name the agreed method and currency either way.

6. Remedies: the rework / reject / discount ladder

A clause that only says "goods shall be free of defects" gives you a right with no machinery. What you want is a pre-agreed ladder of outcomes, so that when an inspection fails the next step is already in the contract instead of being invented mid-argument:

Rework. For fixable defects — bad packing, missing labels, cosmetic issues — the supplier reworks or replaces the defective units at its own cost within a stated period, followed by re-inspection. Say who pays for the re-inspection (the supplier, if the first one failed).

Reject. For failures rework can't cure — wrong material, out-of-tolerance dimensions, safety-relevant defects — you're entitled to reject the batch in whole or part and be refunded amounts paid for the rejected goods. Rejection rights that only exist after you've paid 100% are decorative; this is why the payment sequencing in section 5 matters.

Discount. For marginal failures — goods you can still sell, at a lower standard than contracted — a negotiated price reduction against documented defect rates. It resolves the common middle case, but it should be your option, not the supplier's default escape.

Add two supporting pieces: a claim window — a stated period after delivery to notify latent defects, with photographic evidence, so "inspection passed" doesn't extinguish claims the sampling couldn't catch — and a statement that the reference sample and spec control any disagreement about whether something is a defect.

Be realistic: the ladder's power is mostly pre-litigation. Suppliers comply because it's written, unambiguous, and cheaper than losing the relationship — not because you'll sue over one bad batch. That's exactly why it must be unambiguous.

7. The PO and your NNN are separate documents

The NNN agreement — non-disclosure, non-use, non-circumvention — is not a section of your supply contract, and the sequencing matters:

The NNN comes first, before you share drawings, CAD files, or detailed specifications with anyone — including suppliers you never end up ordering from. The supply contract and PO come later, with the supplier you choose. If confidentiality protection lives only inside the supply contract, every factory you quoted but didn't pick received your design with no protection at all.

Keep them separate, and have the supply contract reference the NNN by date and parties so the documents are tied together. Our NNN agreement guide covers drafting and timing in full — the short version: NNN before specs, contract before money.

8. Mould ownership belongs in the contract

If your order involves custom tooling — injection moulds, dies, jigs — the supply contract must say, in terms, that you own the tooling you paid for, that the supplier holds it only to produce your orders, may not use it for any other customer, and will release it to you (or your nominated new factory) on request or on termination.

Without this clause, the default reality is possession: the mould sits in the factory, and the factory's practical position is that it's theirs. Every future negotiation becomes a hostage situation — you can't move production without abandoning the tooling you funded. Ownership, marking, maintenance, and release mechanics are covered in the custom moulds and tooling IP guide; at minimum, the ownership and release clause goes in the supply agreement and the tooling invoice should be in your name.

9. When Trade Assurance is enough instead

Not every order justifies the full contract stack. Buying an off-the-shelf product, in modest volume, with no custom design and no tooling? Ordering through Alibaba Trade Assurance with a genuinely detailed written spec attached to the order can be a proportionate substitute — a platform-administered claims process tied to the order terms is worth more than an unenforced paper contract a small buyer would never litigate. Just know its shape: escrow releases to the supplier at shipment, not on your acceptance, so what you are buying is a dispute forum rather than a held deposit.

Two cautions. First, Trade Assurance is only as good as the spec you attach: the platform adjudicates against what's written in the order, so section 3 still applies in full. Second, know when you've outgrown it — custom designs, custom tooling, orders large enough to hurt, or anything placed off-platform mean you need the real stack: NNN, supply agreement, PO, and inspection-linked payment.

The bottom line

A chat log and a proforma invoice describe a purchase; they don't govern one. What makes a China order enforceable — and a defect claim winnable — is a deliberate stack: a supply agreement under Chinese law, bilingual with the Chinese version prevailing, signed with the supplier's registered Chinese legal name and official chop; POs under it with a contract-grade spec (tolerances, material grades, Pantone codes, packaging, AQL criteria, photo exhibits); the balance released only against a passed inspection; a rework/reject/discount ladder agreed in advance; the NNN signed separately and first; and mould ownership in writing if there's tooling.

None of this is exotic — for typical orders it's mostly discipline rather than legal spend. But it is contract drafting, and this is practitioner guidance, not legal advice; for bespoke agreements or high-stakes orders, have a China-qualified lawyer draft the documents.

If you'd rather have the contract stack, the spec, and the inspection regime set up as part of a managed sourcing project, get a quote — it's part of every order we run.

Related: NNN agreements · 30-point supplier verification · AQL 2.5 explained · Paying Chinese suppliers · Custom moulds and tooling IP