Legal analysis: not effective, the contract between the two parties is not effective if only one party signs it. A contract is an agreement on the relationship between the rights and obligations of both parties, and it is the embodiment of the consensus of both parties, so the contract needs to be signed by both parties, otherwise it will not take effect. According to the law, if the parties conclude a contract in the form of a contract, the contract will be established when both parties sign or seal it. One party to a contract, no matter how many people there are, is only one party to the contract. If all the parties fail to sign (on the premise of no agency), it shall be deemed that the parties' signature is incomplete, and the parties to the contract have not reached an agreement on the expression of will, and the contract is not established. It usually takes two signatures to take effect. If only one person signs, the validity of the agreement cannot be applied to the unsigned person.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). 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.