Since the implementation of the Two-child policy，Shenzhen experienced a peak fertility period in 2016-2019，but from 2020 onwards，the fertility population re-presented a downward trend. 2021，the state implemented the policy that a couple can have three children and introduced relevant supporting measures. This survey focuses on the fertility intention of Shenzhen citizens. The survey found that only 11.7% of respondents had the will to have a 3rd child or more，the largest number of citizens（49.3%）wanted to have 2 children，and the percentage of those who did not want to have children reached 8.7%. The main reasons for the low willingness to have children are the financial pressure，lack of time and energy to take care of children，and the pressure on children’s education. The most important supporting policies that people want the government to provide for childbirth，ranked in terms of demand，are the issuance of childbirth subsidies，the provision of housing support policies for multi-child families，the promotion of educational equity and the supply of quality educational resources，and the extension of maternity leave or the implementation of parental leave. It is recommended to increase the supporting policies for childbirth，improve the childcare service system，and promote employment policy support for married women who have already had children.