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: Article 143 of the Civil Law of People's Republic of China (PRC) is valid for civil juristic acts that meet the following conditions: (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.