1. The signature on bills and settlement vouchers refers to signature, seal or signature plus seal. 2. The signature of the drawer of the bank draft (that is, the handling bank with the right to issue the bank draft) on the draft is the special seal for the bank draft approved by the People's Bank of China plus the signature or seal of its legal representative or its authorized agent. (1) The signature of a bank when accepting a commercial bill, handling the rediscount and rediscount of commercial bills shall be the special seal for bank bills approved by the People's Bank of China and the signature of its legal representative or its authorized agent. (2) The signature of the drawer of the cashier's check (i.e. the handling bank issuing the cashier's check) on the draft is the special seal for cashier's check recognized by the local people's bank, and it is uniformly engraved with the signature or seal of its legal representative or its authorized agent. (3) The signature and seal of the unit on the bill shall be the special financial seal or official seal of the unit plus the signature or seal of the legal representative or its authorized agent. The signature of an individual on a bill of exchange shall be his signature or seal. (4) The signature of the drawer of the check and the acceptor of the commercial acceptance bill on the bill of exchange shall be reserved by the bank. 3. If the signature of the drawer on the bill does not conform to the provisions of the Bill Law, the Measures for the Implementation of Bill Management and the Measures for Payment and Settlement, the bill is invalid; (1) If the signature of the acceptor or guarantor on the bill does not conform to the provisions of the Bill Law, the Measures for the Implementation of Bill Management and the Measures for Payment and Settlement, its signature is invalid, but it does not affect the validity of other signatures that conform to the provisions; (2) If the endorser's signature on the bill does not conform to the provisions of the Bill Law, the Measures for the Implementation of Bill Management and the Measures for Payment and Settlement, its signature is invalid, but it does not affect the validity of its predecessor's signature that conforms to the provisions.