Legal analysis: It is valid to sign but not to press the fingerprint, and the effect of signing and pressing the fingerprint is the same. If the parties conclude a contract in the form of a contract, the contract shall be established when both parties sign or seal it. The signature or seal is also valid.

legal basis: article 49 of the civil code of the people's Republic of China

if the parties conclude a contract in the form of a contract, the contract shall be formed when all 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 writing as stipulated by laws and administrative regulations or agreed by the parties. if the parties fail to do so in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.

article 491 if the parties enter into a contract in the form of letters or data messages and require the signing of a letter of confirmation, the contract is established when the letter of confirmation is signed.

if the information of goods or services released by one party through information networks such as the internet meets the conditions of the offer, the contract is established when the other party selects the goods or services and submits the order successfully, unless otherwise agreed by the parties.