The main trademark plays the role of distinguishing the source of goods, praising the quality of goods and highlighting the brand of enterprises. Sub-trademarks play a secondary role in expressing the information characteristics of specific goods such as use, function, specification, composition and technology.

Sub-trademarks are trademarks derived from enterprise brand structure and brand planning, and are more for expressing business information. In the traditional theory of trademark law, a trademark is a symbol to distinguish the source of goods.

But in practice, we have noticed that some enterprises have applied for hundreds of trademarks, among which the main trademark of the enterprise or the main trademark of the product can really or mainly distinguish the source of the goods.