Abstract: The geology of Daqing area belongs to the seasonal frozen soil of severe cold regions. In winter,the foundation of PV brackets is prone to uneven frost heave and uplift. In spring,due to the increase in temperature,the bracket foundation is prone to thaw settlement,resulting in differential frost heave and thaw settlement,which leads to the deviation of PV brackets and changes the installation inclination angle of PV modules. Ultimately,the power generation capacity of PV modules is affected. This paper uses the degree of displacement caused by frost heave and thaw settlement of PV brackets due to differences in soil foundation to characterize the installation inclination angle deviation of PV modules. The PV power generation system design software PVsyst 7.2 is used to analyze the impact of installation inclination angle deviation of PV modules on their power generation capacity. The results show that the daily power generation capacity of PV modules varies with the installation inclination angle under different solar terms. Although the positive and negative deviation of the installation inclination angle does not cause the maximum daily power generation capacity at each solar term to appear at the initial installation inclination angle（optimal installation inclination angle）,the annual total power generation capacity of PV modules is still the highest at the initial installation inclination angle. The positive deviation of the installation inclination angle leads to a higher reduction in power generation capacity. It is hoped that the research on differential frost heave and thaw settlement deviation of PV bracket and pile foundation can provide reference for ensuring the service life of PV modules and the power generation efficiency of PV power station.