Legal analysis: You can use any finger to print the contract, and they have the same legal effect. Generally speaking, the thumb and index finger of the right hand are relatively more important and are not easily missing. Therefore, it is recommended that you use your right thumb or index finger when fingerprinting the contract.

Legal basis: Article 490 of the "People's Republic of China and Civil Code" Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it.