Legal analysis: violation of family planning three-child penalty rules: payment of social maintenance fees, according to their previous year's total income of thirty percent. Those who give birth to a child, those who give birth to a child out of wedlock and those who illegally adopt a child shall pay social maintenance fees in accordance with the law.

Legal basis: The People's Republic of China Law on Population and Family Planning Article 41 Citizens who give birth to a child without complying with the provisions of Article 18 of this Law shall pay social maintenance fees in accordance with the law. If a citizen fails to pay the full amount of the social rearing fee due within the prescribed period, he or she shall, from the date of non-payment, be subject to a late fee in accordance with the relevant provisions of the State; if he or she still fails to pay the fee, the family planning administrative department that made the decision on the collection of the fee shall, in accordance with the law, apply to the people's court for compulsory execution.