Legal analysis: signature and seal have legal effect as long as they are recognized by both parties. Signature is also a civil legal act, as long as it is the true intention of both parties, it does not violate the relevant provisions of laws and regulations and public order and good customs.

Legal basis: Civil Code of People's Republic of China (PRC).

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.

Article 144 A civil juristic act performed by a person without capacity for civil conduct is invalid.