Legal analysis: A civil juristic act is valid if it meets 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. "Master slave contract, contrary to public order and good customs, is invalid.

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 150 If one party or a third party coerces the other party to carry out a civil legal act against its true meaning, the coerced party has the right to request the people's court or an arbitration institution to cancel it.