How to Verify a Chinese Factory Before Wiring Any Money

Most buyers who lose money to Chinese suppliers don’t lose it to outright fraud. They lose it to factories that look legitimate, communicate well, and simply cannot deliver what they promised. The problem isn’t detecting scams — it’s detecting mismatches between what a factory claims and what they actually do.

Factory verification has five levels. Most buyers stop at level one. This guide walks through all five, with specific checks you can run from your desk before wiring any money.

The five levels of factory verification

Level 1 — Document verification (30 minutes, free) Level 2 — Cross-reference verification (2 hours, free) Level 3 — Technical capability check (1–2 hours, free) Level 4 — Sample validation ($200–$2,000 depending on product) Level 5 — On-site audit ($300–$800)

Levels 1 through 3 catch the majority of problems. They’re also free and fast. Do not skip them because you’re in a hurry.

Level 1: Document verification

Request three documents before any serious conversation:

Business license (营业执照) — Check that the registration type includes manufacturing (制造业 or 生产). If the scope is trading (贸易) or technology (科技) without manufacturing, you’re talking to a trading company. This isn’t always bad, but it changes the negotiation dynamic and pricing structure.

Export license or foreign trade registration — A factory that has never exported may not understand FCC, CE, or RoHS requirements. Ask for their customs registration code and verify it against China’s customs database. A factory that exports regularly will have this ready.

ISO 9001 certificate (if they claim to have one) — Note the certificate number and the issuing body. Search the certificate number on the issuing body’s website. Fake ISO certificates are common; real ones take 30 seconds to verify. If the certificate doesn’t check out, that’s not a minor issue — it’s a factory that falsified credentials.

Where to check these documents. The business license can be verified through the National Enterprise Credit Information Publicity System using the 18-digit unified social credit code. The export registration can be checked through China Customs’ enterprise credit system. ISO certificates from major bodies like SGS, TÜV, Bureau Veritas, and BV are searchable on the certifier’s website. If the factory provides an ISO certificate from a body you have never heard of, search for the body on the IAF MLA signatory list.

Level 2: Cross-reference verification

This is where most buyers stop doing homework. Don’t.

Alibaba vs. 1688 cross-check — Search the factory’s company name on 1688.com, China’s domestic wholesale platform. If the same company sells the same products at 20–40% lower prices on 1688, you’ve learned two things: they’re a real factory (traders don’t list on 1688), and the Alibaba price includes a “foreign buyer premium.” Use the 1688 price as your negotiation baseline.

If you can’t find the company on 1688 at all, two possibilities exist: they’re exclusively export-focused (uncommon for mid-size factories), or they’re a trading company using a different registered name.

Customs data search — Services like Panjiva, ImportGenius, or Jungle Scout’s supplier database show export records. Look for the factory’s name in shipment records. A factory that claims to export $5M annually but has no customs record in the past two years is inflating their experience. This check costs $50–$100 through most data providers and is worth it for any order over $10,000.

Website and social media audit — Real factories in China increasingly have WeChat public accounts, Douyin (TikTok) factory tour videos, or at minimum a Chinese-language website. A factory with only an Alibaba page and no other web presence is not necessarily fake, but it’s a weak signal. Look for video content showing actual production floors, not just product renders.

Phone and address checks. Call the number on the business license during China business hours. A legitimate factory will have someone answer who can transfer you to engineering or production. If the same mobile number is listed for five different “factories” on Alibaba, you are likely dealing with a broker network. Use Baidu Maps to check whether the registered address is an industrial park or a residential building. A registered address in a known manufacturing cluster — a Shenzhen factory for electronics or a Dongguan supplier for consumer products — is a positive signal; a polished export company registered in an office tower far from any production base usually is not.

Level 3: Technical capability check

For electronics buyers, this is the most important level and the one general sourcing guides skip entirely.

Product scope alignment — Ask the factory to describe the last three products they manufactured that are similar to yours. Ask for the BOM (Bill of Materials) of one previous product at a component level. A factory that can’t produce a detailed BOM doesn’t engineer products — they assemble them from modules they buy elsewhere. This distinction matters enormously for quality and customization.

Engineering conversation test — Send a technical question that requires engineering knowledge. For a Bluetooth speaker factory: “What’s your approach to enclosure resonance dampening below 200Hz?” For an IoT device factory: “How do you handle antenna de-tuning when the housing material changes from ABS to PC+ABS?”

A real factory’s engineering contact will answer in specific terms. A trading company will either ignore the question, forward it slowly, or give a generic response about “high quality materials.” This test filters out traders with 90% accuracy.

Equipment and line verification — Ask for photos of their SMT line, reflow oven, and testing jigs. Then ask follow-up questions: “What model reflow oven do you use?” “How many zones?” “What’s the oldest active SMT line in your facility?” Fake answers are easy to spot if you know the equipment. A real factory will know their line configuration without checking.

Quality system questions. Ask for their incoming QC process, their in-process check points, and their outgoing inspection standard. A factory that quotes AQL 1.0 but cannot explain how they sample is not actually running AQL sampling. Ask for a copy of their last internal audit report — real factories conduct them quarterly.

Level 4: Sample validation

A sample that works is not enough. A sample that matches your specification is what matters.

Functional test — Confirm the sample does what you need. This is the easy part.

BOM verification — Open the sample and identify the key components. For electronics, this means checking IC markings against your approved BOM. A factory that substituted a cheaper Bluetooth module without telling you has demonstrated they’ll do it in production too. Catch this now.

Build quality inspection — Check solder joint quality under a microscope, housing tolerances with calipers, and cable strain relief. The sample represents the factory’s best effort. If the sample has cold solder joints or 0.3mm housing gaps, production will be worse. A third-party inspection at the sample stage gives you an objective build-quality report when you can’t put hands on the unit yourself.

Certification check — If the factory claims FCC or CE certification for a similar product, ask for the test report and cross-reference the accreditation number with the lab that issued it. A $50,000 production run based on a fake certificate is a common and expensive mistake.

Level 5: On-site audit

If your first order exceeds $20,000 or you’re entering a long-term relationship, visit the factory or send an auditor who knows what to look for. An on-site audit covers everything above plus direct observation of production discipline, ESD compliance, incoming QC processes, and worker training levels.

For a complete breakdown of what to check on-site, see our factory audit checklist.

What a good audit covers beyond documents. An auditor should spend time on the production floor, not just in the conference room. Key observations include: whether operators follow work instructions, whether ESD wrist straps are actually worn, how rejected units are tagged and segregated, whether the calibration stickers on test equipment are current, and how clean the SMT line area is. A factory that refuses floor access during an audit is hiding something.

Trading company or factory? Why it matters

A trading company is not necessarily bad. Some trading companies add real value: they aggregate small orders, manage multiple SKUs, and handle export paperwork. But they charge a margin, and they control less of production than they pretend to.

Signs you are talking to a trading company:

• They cannot answer technical questions directly and always “check with the engineer.”
• They sell products across many unrelated categories.
• Their quote is significantly higher than the 1688 price for the same product.
• They refuse to share the actual factory name or address.

If you need customization, tight quality control, or direct engineering access, go factory-direct. If you need a one-stop shop for many SKUs and accept a margin, a trading company can work. The mistake is paying factory-direct prices for trader-controlled production.

The best trading companies disclose their role upfront and add value through sourcing breadth and logistics coordination. The worst ones pretend to be factories and disappear when quality problems arise.

Five red flags that should disqualify a factory immediately

1. Refuses to share their business license — No exceptions. Any legitimate factory has this.
2. Wants payment to a personal account or different company name — Wire fraud is real. Payment details must match the business license exactly.
3. No engineering contact available — If all communication goes through a sales agent with no technical escalation path, you’re working with a trader.
4. Certification documents that don’t check out — One fake certificate means they’ll fake others.
5. Price is 30%+ below every other quote — This isn’t negotiation skill. It means they’re planning to substitute components, skip testing, or disappear after the deposit.

A practical verification scorecard

Use a simple scoring system to compare suppliers objectively:

Any supplier with more than one “Fail” should be dropped. Any supplier with more than two “Conditional” results needs a clear remediation plan before you proceed.

Save the scorecard for each supplier. After three or four sourcing projects, you will have a pattern of which checks predict problems later. In our experience, “no engineering contact” and “unverifiable certification” are the two strongest predictors of a bad production run.

After verification: what to do next

Verification is not a one-time event. Once you select a supplier, add a verification checkpoint before each significant order:

• Confirm the business license is still valid (annual review periods can cause temporary issues).
• Re-verify any certificate that has an expiration date within your production window.
• Update your supplier file with notes from each audit or inspection.
• Ask for two reference customers who placed orders in the last 12 months. A factory that cannot provide recent references either has no repeat business or is hiding something.

A supplier that passed verification two years ago may have changed ownership, moved facilities, or lost key engineering staff. Treat verification as ongoing due diligence, not a box to check once.

When you’re ready to pay

Complete levels 1–3 before sending a sample payment. Complete level 4 before placing a production order. Complete level 5 before any order over $20,000 or any exclusive supplier relationship.

The verification process takes 2–3 days of focused work and costs nothing for the remote stages. The alternative is discovering problems after you’ve wired 30% deposit and spent six weeks waiting for production that doesn’t meet spec.

The five verification levels apply to suppliers of Android TV boxes, WiFi 6 access points, smart thermostats, TWS earphones, wireless charger pads, and dash cams. For the connector details that separate real factories from traders, see board-to-board connectors, pin headers and Dupont, and JST connectors.

If you’re at the verification stage and need an engineering-led review of your supplier shortlist, our sourcing service includes full factory verification as the first step — before any money changes hands.

Verification is the entry point to a longer sourcing process. Once you’ve cleared a factory, how to source electronics from China walks through quoting, sampling, and the production order itself. We took an EU hardware startup through exactly this sequence in the Bluetooth speaker case study, where the engineering conversation test in Level 3 disqualified two of the three shortlisted “factories” before any deposit moved.

The buyers who get burned are rarely the ones who skipped verification entirely. They are the ones who did half of level one and trusted a good sales pitch for the rest. Complete the five levels for any order that matters, and keep the scorecard as a record of why you chose this factory over the alternatives.