Legal analysis: Both are acceptable. As long as it is true, it has the same effect successively (first sign and then seal). Stamping and signature belong to the confirmation procedure, and there is no clear difference in the procedure order in the confirmation of effectiveness. In the same document, they can all have the same effect, or they can only have a name or seal, and they all have effect. A legally established contract shall take effect upon its establishment.

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.