It is very similar to the fact that the trademark register in Britain and some Commonwealth countries is divided into two parts, A and B. Some trademarks that lack distinctiveness and secondary meaning but can distinguish the applicant's goods or services can be registered in the "Deputy Book". If the trademarks in the "Deputy Book" have been used for five consecutive years (the period may be considered as appropriate for heavy use), they may be upgraded from the "Deputy Book" to.

this provision makes it unnecessary for some trademarks that have been put into commercial use to give up trademark registration because of the lack of distinctiveness, thus losing the accumulated goodwill for a long time, which is also a kind of relief for the applicant. In addition, for some trademarks that have been rejected due to lack of distinctiveness, they can also maintain their registration by applying for registration as a "deputy book", and then apply for registration as a "main book" after they have obtained distinctiveness through continuous use for more than five years.