1. This is valid in principle. When both parties sign or seal the contract, the contract is established according to law. A legally established contract shall have legal effect upon its establishment. Where it is necessary to go through the formalities of examination and approval and registration according to laws and administrative regulations, it shall have legal effect after going through the formalities of examination and approval and registration.

However, if both parties to the contract agree that "the contract will come into effect after both parties affix the official seal of the enterprise and the legal representative signs it", but the contract only has the official seal of the enterprise (legal person) without the legal representative's signature, the contract has not yet taken legal effect.

In addition, although the two parties have not agreed on the conditions for the contract to take effect, and the contract is stamped with the official seal of the enterprise, one party can prove that the process of concluding the contract belongs to the statutory conditions for dissolution or modification as stipulated in Article 54 of the Contract Law, or is invalid as stipulated in Article 52 and Article 56 of the Law, and the parties may request dissolution or modification of the contract according to law, or declare the contract invalid.

Finally, it is necessary to clarify a special situation in which a contract takes effect, that is, according to the provisions of Articles 36 and 37 of the Contract Law, a contract concluded in the form of a contract has not been adopted by both parties, or before both parties sign and seal, one party has fulfilled its main obligations and the other party has accepted it. Regardless of whether the contract is signed and sealed, and whether the law requires both parties to use a written form, both parties do not use a written form.

2. The parties may agree on the validity of a conditional contract. A contract with effective conditions shall become effective when it meets the conditions, and a contract with dissolution conditions shall be invalid when it meets the conditions.

If a party improperly facilitates the fulfillment of a condition for his own benefit, it shall be deemed that the condition has not been fulfilled, and if it improperly prevents the condition from being fulfilled, it shall be deemed that the condition has been fulfilled.

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Judicial basis: Articles 32, 36, 37, 44, 45, 52, 53, 54 and 56 of People's Republic of China (PRC) Contract Law.