According to the query of Baidu French Open, if the contract has been actually performed, it will be deemed as valid, and both the signer and the fingerprint signer will bear legal responsibility. In judicial practice, the most prudent choice is the combination of signature and thumb print. Signature is the natural expression of personal handwriting and the embodiment of personal true meaning, but there are also cases where people do not recognize others to sign on their behalf after carrying out actions. Although it is not easy to identify by fingerprint, its role in determining identity can solve disputes to some extent. Therefore, the combination of signature and fingerprinting can complement each other and is a realistic choice to avoid risks.