背书的主要目的在于转移票据权利，由于背书所具有的方便而又安全的特点，因此背书也可用于其他目的。这种以授予他人一定票据权利，而不是以转移票据权利为目的的背书称为非转让背书．根据（上海市票据暂行规定）第助条和第利条之规定，非转让背书有委任背书和设质背书两种。 The main purpose of endorsement is to transfer the right of the instrument, and the endorsement can be used for other purposes due to the convenient and safe endorsement. This type of endorsement that grants someone the right to negotiate a bill, but not for the right to negotiate a bill, is called a non-transfer endorsement. According to Paragraphs (a) and (b) of the Provisional Rules for Shanghai Notes, there are two types of non-transfer endorsing: endorsement and endorsement.