Legal analysis: If there are clear terms in the agreement that will take effect after being sealed, but only the legal representative signs it and does not affix the official seal, the agreement will not take effect. If there is no such clause that comes into effect after being sealed, the agreement will come into effect when both parties have the signatures of legal representatives and no official seals. The entry into force of the contract means that the established contract has certain legal binding force between the parties, which is usually called legal effect. The establishment and entry into force of a contract are often closely linked. The purpose of concluding a contract is to make the contract binding, so as to realize the rights and interests stipulated in the contract. If the contract fails to take effect, it will become a dead letter, and the parties will lose the purpose of concluding the contract. Generally speaking, the following conditions should be met: 1, the contracting parties should be two or more parties, and there are two stages or processes of offer and acceptance stipulated by law to reach an agreement on the main terms (in some cases, some form is needed as a carrier to express it). In addition, for an actual contract, the actual deliverable should also be regarded as a requirement for establishment. If the above conditions are met, the contract can be established. As for the validity of the established contract, it depends on whether it is established according to law. As long as it is a legally established contract, it should be valid.

Legal basis: Article 16 of People's Republic of China (PRC) Labor Contract Law shall come into effect after the employer and the employee reach an agreement through consultation, and the text of the labor contract shall be signed or sealed by both the employer and the employee. The text of the labor contract is held by the employer and the employee respectively.