Abstract: At present, it is in the intersection period of the distributed photovoltaic whole county model and the grid parity. The differences in the endowment of light resources and policies in different places indicate that the promotion of household rooftop photovoltaics should not be generalized. Based on the evolutionary game theory, the four-dimensional evolutionary system for the household photovoltaic market of the roof owners, the power grids, the photovoltaic enterprises, and the government under the three policies of installed capacity subsidy, electricity subsidy and grid parity are constructed. By selecting two places to making experiments, the dynamic equilibrium state of the two places under each subsidy policy is simulated, and is Pareto improved based on the game model of the grid parity. The results show that the ideal county-wide equilibrium state of the self-built rooftop photovoltaics can be achieved in areas with abundant lighting resources and low electricity consumption, and it can be accelerated through cost savings, on-grid electricity prices, and residential electricity subsidies; For regions with relatively scarce lighting resources and large electricity consumption, the ideal balance can hardly be achieved under the three types of subsidy policies, and the residents' electricity subsidy is an effective tool to achieve Pareto improvement; The PV companies still dominate the competition with the state-owned enterprises, and the government regulation will gradually be replaced by marketization.