Abstract: The mode of integration between traditional new energy power stations is simple and does not take into account the uncertainty of wind and photovoltaic output. The phenomenon of wind and PV curtailment is serious. To this end,the paper proposes an optimal configuration strategy for the thermal storage capacity of CSP plant in wind-PV-CSP hybrid system considering the uncertainty of the wind and photovoltaic output. The power-to-heat technology is used to effectively couple the wind and PV power station as well as CSP plant,clarifying the framework and principle of the hybrid system. The improved Latin hypercube sampling method is employed to suppress the uncertainty of the wind and photovoltaic output. Finally,a double-layer optimal configuration model of the thermal storage capacity for CSP plant based on typical wind and photovoltaic output scenarios is constructed,and an example is solved. The results show that the proposed method significantly reduces the total investment and operating costs of the system,and improves clean energy consumption capacity.