Legal analysis: the contract will take effect when it has the ID number and signature. The ID number and signature of the contract appear in the following situations: 1. The signature of the contract does not have to be consistent with the identity card to have legal effect. At the beginning and end of the contract, the ID number is signed next to the name to avoid the defendant arguing that the signer has the same name as himself. 3. If the signature of the contract is inconsistent with the ID number, the signatory of the contract is usually regarded as the party to the contract.

Legal basis: Article 490 of the General Principles of Civil Law of People's Republic of China (PRC) and the national code. If the parties enter into a contract in the form of a contract, the contract shall be 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.

A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.