Abstract: In order to improve utilization efficiency of solar energy,a kind of solar cogeneration system with absorption heat pump based on Solar Thermal Power（STP）tower plant is presented in this paper. The 1 MW STP tower plant in Beijing serves as a case study to analyze the proposed system. With mathematical models of each component,simulation platform of the proposed system is developed under TRNSYS application environment. The dynamic performance is simulated at ten minute intervals during the whole heating season.The simulation results show that the proposed system can guarantee continuous heating for consumers. Attributed with the contributions of the regenerative cycle,the power generation in the proposed system is also effectively improved. Comparing with the original STP tower plant,the overall energy efficiency of the proposed system is increased from 11.26% to 14.67%.