general knowledge of trademark use: pay attention to the preservation of evidence of use; According to the provisions of the Trademark Law and the Implementation Regulations, anyone who has stopped using it for three consecutive years without justifiable reasons may apply to the Trademark Office for cancellation. However, in practice, it often happens that some registrants fail to submit valid use evidence because they do not pay attention to the preservation of original materials, which leads to the loss of trademark rights. In addition, in the process of foreign-related registration, the registration administration departments of some countries also require the submission of evidence of use, or in the double? In case of dispute, the party shall confirm the right according to the use of evidence. Therefore, registrants, especially small and medium-sized enterprises with irregular management, should pay more attention to the preservation of evidence of use.