Based on the multi-source theory，this paper constructs a three-force action space model of “political potential pressure，policy network thrust and mass demand leverage” and uses qualitative comparison method with multi-variable interactions taking such super big cities as Beijing，Shanghai and Guangzhou as case studies，to explore the supply path of collective construction land rental housing policy，in order to provide reference experience for pilot promotion.The results show that among the six variables of national policy，organizational leadership change，related policy，platform building，portal messages and public opinion crisis，the consistency between national policy and platform building is the highest.The cities of Beijing，Shanghai and Guangzhou have different policy supply path mechanisms.The main driving forces for Beijing’s collective construction land rental housing policy supply path are the pressure of political potential energy and the leverage of mass demand，while policy network is the driving force in Shanghai and in Guangzhou the combination of political potential energy pressure，policy network thrust and mass demand leverage has a significant effect.The participation of the masses in the configuration of policy supply paths needs to be improved.In conclusion，we should attach importance to policy publicity and the connection and response of relevant policies， improve the complementarity among policies， so as to achieve better policy effects in the entire policy system.In the future，in the process of promoting the pilot policies，we should fully consider the urban endowment，explore the combination of policy supply paths suitable for urban characteristics，and promote the efficient opening of the policy window in the pilot areas.