1. If the similarity of a trademark exceeds 80%, it is considered infringement. 2. The similarity of trademarks mainly depends on whether it is likely to cause confusion among the relevant public. If the trademark is so similar that it confuses the relevant public, it will be considered infringement. 3. According to the definition of relevant laws, trademark infringement refers to the use of an identical or similar trademark to the registered trademark on the same or similar goods without the permission of the trademark owner.