Effective. According to the analysis of "Legal Express", according to Article 490 of the Civil Code, if the parties conclude a contract in the form of a contract, the contract is established when the parties sign, seal or press their fingerprints; Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it; Therefore, when signing, only the surname is signed, which is legally binding and an effective act agreed by both parties. To sign, that is, to write one's name, especially to express agreement, recognition, responsibility or obligation.