1. Contracts signed on blank contracts are generally invalid. The blank contract does not specify the specific content of the contract, and the rights and obligations of both parties are not clear. The signature can't prove that the parties have expressed their true meaning to the contents added after the contract.
2. If one party asks the other party to sign a blank contract and asks it to bear the contract responsibility for the added contents after signing, it is an act that aggravates the other party's obligations, and the contractor does not need to bear the responsibility for it.
3. If the parties to a contract have negotiated the contents of the contract in advance, and the contents added after signing are consistent with the previous consultations, it can be considered that the contents of the contract are the true intention of the parties and the contract is valid.
Form of concluding a contract
The parties may conclude a contract in writing, orally or in other forms. Written form refers to contracts, letters, telegrams, telexes, faxes and other forms that can tangibly express the contents contained. A data message that can tangibly express its content through electronic data interchange, e-mail, etc. , and can be retrieved at any time, are considered in writing. 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. A legally established contract shall come into force upon its establishment, except as otherwise provided by law or agreed by the parties.
Generally speaking, a labor contract is invalid or partially invalid if the other party concludes or changes it against the true meaning by means of fraud, coercion or taking advantage of the danger of others. Any dispute over the invalidity or partial invalidity of a labor contract shall be confirmed by the labor dispute arbitration institution or the people's court.
Legal basis:
People's Republic of China (PRC) Civil Code
Article 143
A civil juristic act that meets the following conditions is valid:
(1) The actor has corresponding capacity for civil conduct;
(2) the meaning is true;
(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.
Labor Contract Law
Article 26
The following labor contracts are invalid or partially invalid:
(1) Causing the other party to conclude or change a labor contract against its true meaning by means of fraud, coercion or taking advantage of the danger of others;
(2) The employer exempts itself from legal liability and excludes the rights of workers;
(3) Violating the mandatory provisions of laws and administrative regulations.
Any dispute over the invalidity or partial invalidity of a labor contract shall be confirmed by the labor dispute arbitration institution or the people's court.