Draft/postal draft/draft/draft is issued by the drawer, requiring the payer to unconditionally pay a certain amount of bills to the payee or holder at sight or within a certain period of time. Bill of exchange is the most widely used credit tool in international settlement. Bill of exchange is one of the most common bill types. Article 19 of China's Bill Law stipulates: "A bill of exchange is a bill issued by the drawer, and the payer is entrusted to unconditionally pay a certain amount to the payee or the holder at sight or on a specified date." It is a kind of confiscated securities, and there are at least three people in the basic legal relationship: (1) the drawer, (2) the holder of the ticket, and (3) the payer entrusted to pay the holder.