The contract is valid as long as its contents are legal and signed or hand printed.
 According to the law, signature, seal and fingerprint have the same legal effect.
 The necessary terms of the contract should be specific and clear:
 1. The names of the parties must be true and consistent.
 2. The contract object, quantity, quality, price and packaging method shall be specific and clear.
 3. Pay attention to the acceptance method, procedure and time.
 4. The method of performance must be specific: delivery method and settlement method.
 5. The time limit for performance must determine a certain point or period of time.
 6. Try to make it clear that the place where the company is located is the place where the contract is performed.
 7. The liability for breach of contract shall be quantified as liquidated damages or the calculation method for determining liquidated damages.
 [Legal Basis]
 Article 143 of the Civil Code Civil legal acts that meet the following conditions are valid:
 （1） The actor has corresponding civil capacity;
 （2） True declaration of intention;
 （3） It does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.