The validity of a contract should be judged from two aspects. Whether 1. meets the effective conditions. The conditions for the contract to take effect include: whether the parties to the contract have civil capacity, whether the expression of will is true, and whether the contents of the contract violate laws and administrative regulations. The second is whether the contract belongs to the invalid contract stipulated in the contract law. Effective. Article 32 of the Contract Law: If the parties conclude a contract in the form of a contract, the contract is established when both parties sign or seal it. It can be seen that the signature of the legal representative and the seal of the company do not need to be available at the same time. Electronic signature is generated under the background of Internet. In 2005, the "Electronic Signature Law" officially landed, and it was legally "verified". Article 2 of the Electronic Signature Law: The term "electronic signature" as mentioned in this Law refers to the data contained in a data message, which is used to identify the identity of the signer and show that the signer approves its contents.