Legal analysis: If there is a clear clause in the contract stating that it will take effect after the legal person signs and seals, then the agreement will not take effect without the official seal and the signature of the legal representative. There are no effective clauses signed and sealed, and there is no effective agreement signed and sealed by the legal representative.

Legal basis: This contract was established when Article 483 of the Civil Code of People's Republic of China (PRC) took effect, unless otherwise stipulated by law or agreed by the parties. Article 490 Where the parties conclude a contract in the form of a contract, the contract is formed when the parties sign, seal or fingerprint it. 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.