1. How to sign an electronic contract to be legally effective? The signing of an electronic contract is different from a paper contract. It does not require printing, handwritten signatures and seals. Although the entire process is operated online, there are still many roles involved. If electronic signatures are to be effective, these roles all play an important role that cannot be ignored. For example, third-party electronic signature platforms and CA institutions need to authenticate users' identities, and third-party electronic signature platforms also need to provide reliable electronic signature technology to ensure the validity of electronic signatures. Finally, the third-party electronic signature platform also needs to provide legal services such as certificate deposit and issuance services and online arbitration to meet users' various needs in electronic contract storage and contract disputes.

2. Requirements for the validity of electronic contracts As a special form of contract, the validity of electronic contracts requires the following legal conditions:

1. The contracting parties are two or more parties. The contracting subject refers to the person who actually concludes the contract. They can be either the future contract parties or the agents of the contract parties. Regarding the validity of an electronic contract entered into by a natural person who does not have the corresponding capacity for civil conduct, some people consider that from the perspective of protecting the interests of the non-fault party, a person without capacity or with limited capacity who uses telecommunications should be regarded as a person with capacity. However, this will undoubtedly encourage the occurrence and proliferation of irresponsible behavior on the Internet. Not only will the original intention of protecting the non-fault party not be realized, but it will harm the interests of both parties. Moreover, this will also be related to the lack of capacity for civil conduct and the restriction of capacity for civil conduct. The purpose of the system is inconsistent. Therefore, an electronic contract in which one party lacks the corresponding civil capacity should also be determined to be invalid or a contract whose validity is pending.

2. Electronic means true. That is, the use of information processing systems or computers to express true intentions. The expression of meaning consists of two factors: one is the subjective element of the inner meaning, and the other is the objective element of the external expression of this consciousness. However, with the advancement of technology, parties may use mechanical or automated methods to express their intention for an offer or acceptance. Today, with the development of the Internet, computer programs or hosts can "express their intentions" on their own within the scope of their programming, and the parties do not intervene in the process of expressing their intentions at all. This is an "electronic agent", and an electronic agent should independently represent an individual. For expression of intention or acceptance of expression of intention, the individual represented shall bear corresponding legal liability.

3. The establishment of a contract should have two stages: offer and acceptance. The way to conclude a contract in our country must go through two stages: offer and acceptance, and reach a unanimous expression of intention. The offer of an electronic contract refers to the intention of a willing person to enter into a contract with another person through the Internet. Commitments made through the Internet are generally made in response to offers issued on the Internet. The promisee can make a promise either in the form of email or by clicking. If the negotiation is only conducted online, but the commitment is made offline through face-to-face signing or telephone and telegram, etc., it is still a commitment made in the conclusion of a general contract, not a commitment made in the conclusion of an electronic contract.