Generally speaking, the contract is based on the original, which means that the original has legal effect. And copies generally have no legal effect. But if the copy is consistent with the original, it has certain legal effect, but it is lower than the original. Unless the two parties to the contract re-sign the copy, and indicate that the copy has the same effect as the original after negotiation and signing by both parties. If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

How to stipulate the validity of the contract?

(1) The parties may attach conditions to the validity of the contract.

A contract with effective conditions shall take effect when the conditions are met. A contract with termination conditions is invalid when the conditions are met.

If a party improperly prevents a conditional achievement for his own benefit, it shall be deemed that the conditional achievement has been achieved, and if it improperly promotes the conditional achievement, it shall be deemed that the conditional achievement has not been achieved.

(2) The parties may stipulate the time limit for the contract to take effect.

A contract with an effective term shall take effect upon the expiration of the term. A contract with a termination period is invalid at the expiration of the period.

3. What are the rights of defense in the performance of the contract?

In simultaneous performance, the parties can enjoy the right of defense of simultaneous performance, the right of defense of prior performance and the right of defense of uneasiness. The establishment of these rights of defense enables the parties to oppose each other's claims under legal circumstances, so that the parties' refusal to perform does not constitute a breach of contract and can better safeguard the interests of the parties.

1, and exercise the right of defense at the same time.

If the parties owe each other debts due, and there is no order of performance, they shall perform at the same time. One party has the right to refuse the performance requirements of the other party before performance, and the other party has the right to refuse the corresponding performance requirements when the performance does not meet the contract.

2. Exercise the right of defense first.

If the parties owe each other debts, there is a sequence of performance. If one party performs first, the other party has the right to refuse its performance requirements. When the first performing party fails to perform the contract, the second performing party has the right to reject its corresponding performance requirements.

3. The right of uneasy defense.

The exercise of the right of uneasy defense is divided into two stages: the first stage is the suspension of performance. If the party who should perform the debt first has definite evidence to prove that the other party has one of the following circumstances, it can suspend performance: the business form has seriously deteriorated; Transfer property, withdraw funds and evade debts; Loss of commercial credit; There are other circumstances in which the ability to perform debts is lost or may be lost. The second stage is to terminate the contract.

Legal basis: Article 469 of the Civil Code stipulates that both parties may conclude a contract in writing, orally or in other forms.