If one party signs the contract but the other party fails to sign for a long time, the contract will be invalid. A contract is an agreement between the parties or parties to establish, change, or terminate a civil relationship. A contract established in accordance with the law shall be protected by law. The contract must be signed and confirmed by both parties after negotiation before it can be effective. If it is a unit contract, it must also be stamped with the unit's seal and signed by the responsible person. Even though the contract is signed and sealed by both parties, it does not mean that it is legally binding. In other words, a contract signed by both parties must meet certain requirements to be legally effective. A general contract must meet the following three requirements: First. The perpetrator has corresponding civil capacity, second. Meaning means truth, third. Does not violate the law or social public interests. Article 465 of the "People's Republic of China and Civil Code" A contract established in accordance with the law shall be protected by law. A contract established in accordance with the law is only legally binding on the parties, unless otherwise provided by law. Article 466 If the parties have a dispute over their understanding of a contract term, the meaning of the disputed term shall be determined in accordance with the provisions of paragraph 1 of Article 142 of this Law. If the contract text is concluded in two or more languages ??and agreed to have the same effect, the words and phrases used in each text are presumed to have the same meaning. If the words and phrases used in each text are inconsistent, they shall be interpreted in accordance with the relevant terms, nature, purpose, and the principle of good faith of the contract.