China Trade Mark Classes and Sub-Classes: What Foreign Applicants Miss
China follows the Nice classification but layers its own sub-class system inside each of the 45 classes. Because CNIPA examiners and administrative proceedings judge similarity largely by sub-class, goods sitting in different sub-classes of the same class can be treated as unrelated. Specifying goods to cover the right sub-classes is essential.
The layer the Nice system does not show you
If you have filed trade marks anywhere else, you already know the Nice classification: 45 international classes, goods and services sorted into broad families, the same headings recognised across most of the world. China accepts that framework and then does something the Nice list does not reveal on its face. Inside each class, the China National Intellectual Property Administration (CNIPA) works from a national subdivision, the Classification of Similar Goods and Services, which divides the goods and services into smaller groupings known as sub-classes. This manual builds on the Nice list but is not identical to it, and it descends from long-standing Chinese Trademark Office practice rather than being a fresh CNIPA invention.
The practical effect is that a single Nice class is really a cluster of separate compartments. Class 25, for example, covers clothing, footwear and headgear, but those items are distributed across several sub-classes, and CNIPA treats each compartment as its own territory for the purposes of deciding whether two marks clash. If you are used to an office that assesses goods similarity substantively, case by case, this is the point where foreign filings quietly go wrong.
Why sub-classes change conflict and coverage
It helps to be precise about where the mechanical approach bites. Most examination systems, including the EU, the UK and other first-to-file offices, weigh whether goods are similar on the substance of what the goods are: their nature, purpose, trade channels and whether they compete, assessed case by case, so goods can be similar across classes and dissimilar within one. China's examination starts from a more mechanical position. Goods in the same sub-class are generally presumed similar, and goods in different sub-classes are generally presumed dissimilar, even when a normal commercial reading would say they plainly compete. CNIPA leans heavily on the sub-class tables when it decides whether your application conflicts with an earlier mark, and the same logic runs through administrative opposition and invalidation.
Two qualifications keep that picture accurate. First, the boundary is not purely item-by-item examiner discretion: the Classification of Similar Goods and Services carries its own cross-reference notes that declare certain sub-classes mutually similar, so some compartments are pre-designated as related to each other independent of any individual examiner's judgement. Second, the mechanical approach is strongest in CNIPA examination and administrative proceedings. In civil infringement litigation the courts run a substantive likelihood-of-confusion analysis and treat the sub-class table as guidance rather than a binding rule, so a court may find infringement across a sub-class line that would have stopped an examiner.
That cuts two ways. On the coverage side, it means your registration protects you strongly within the sub-classes you actually claimed, and much less outside them. A registration that lists goods in two sub-classes of a class does not automatically reach a third sub-class in the same class where a competitor is selling near-identical products. On the conflict side, it can help you: an earlier mark that sits in a different sub-class may not block your application even though the goods look related, because the presumption of dissimilarity gives you room. The presumption is rebuttable, and the manual's own cross-references soften some boundaries, but you should plan on the sub-class boundary holding at examination rather than assume it will be looked past.
This is why the standard advice to "just file the class" is unsafe in China. Two applicants can hold the same word mark in the same Nice class, in different sub-classes, and both registrations can stand.
The squatting gap this creates
Trade mark squatters in China understand the sub-class map far better than most incoming brand owners. The gap they exploit is simple. If your registration covers only the sub-classes tied to your current product, a squatter can register your brand in a neighbouring sub-class of the same class, the compartment you left open, and hold a valid registration for goods a customer would see as the same commercial space. Because the two sit in different sub-classes, your existing right may not be enough to knock theirs out on relative grounds, and you can find yourself blocked from expanding into an adjacent product line under your own name, or facing a demand to buy back a registration you should never have had to.
The defence is coverage discipline at the filing stage. Rather than accepting a translated copy of your home specification, the goods should be mapped deliberately onto the Chinese sub-class structure so that the compartments that matter for your real and near-future business are all claimed. That often means listing standard items from several sub-classes on purpose, and thinking a product cycle ahead rather than describing only what you sell today. Getting this right early is far cheaper than a cancellation action or a purchase later. The broader defensive playbook, including filing before you enter the market, is covered in the China trade marks pillar.
Filing so the sub-classes work for you
Practically, the work is in the specification. Draft the goods and services against the current Classification of Similar Goods and Services, use accepted standard descriptions where you can (non-standard wording can trigger objections or delay), and confirm which sub-class each item falls into before you file rather than after. Where a product genuinely spans compartments, claim across the relevant sub-classes instead of hoping one will be read to cover the rest. Timeframes, official fees and the fine detail of the sub-class tables change from time to time, and multi-class and per-sub-class filing costs vary, so official fees apply and you should confirm the current amounts and the current classification with CNIPA or local counsel rather than relying on any figure quoted here.
A note on scope
IPEnvoy is not a law firm and does not provide legal advice. This is general information to help you understand how China's sub-class overlay differs from the Nice system you already know; confirm the current position with CNIPA and a qualified local IP professional before you file. If you would like, IPEnvoy can introduce you to a vetted IP firm in China to map your goods onto the right sub-classes and build a specification that closes the squatting gap rather than leaving it open.