The agreement only has signature and handprint, and it is invalid without ID number. The agreement is valid if the following conditions are met: both parties to the agreement have corresponding civil capacity; The intention of both parties to the agreement is true; The content of the agreement conforms to laws and regulations and public order and good customs; The form of the agreement meets the requirements stipulated by law; Other statutory conditions for entry into force. Legal basis: Article 143 of the Civil Code.

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.

Article 469

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.