一、跟单信用证(DOCUMENTARY CREDIT):是凭跟单汇票或仅凭单据付款的信用证。国际贸易结算中所使用的信用证绝大部分是跟单信用证。二、光票信用证:是凭不附带单据的汇票付款的信用证。三、可撤销(REVOCABLE)信用证:是指开证行对所开信用证不必征得 First, with a single letter of credit (DOCUMENTARY CREDIT): with a single bill or documentary payment of letters of credit. Most of the letters of credit used in international trade settlement are documentary letters of credit. Second, the light vote L / C: It is a letter of credit with a bill of exchange without a voucher. Third, the revocable (REVOCABLE) L / C: Refers to the issuing bank opened letter of credit need not be obtained