Abstract: Taking the daily output data of wind power and solar power in winter from 2018 to 2023 in a certain region as the research object, this paper constructs a two-dimensional joint probability model of wind-solar power by selecting the optimal marginal distribution and copula functions．On this basis, the combined risk level of new energy depletion in different regions is quantitatively evaluated, and the co-occurrence and co-reoccurrence return period of depletion events are calculated．The research results indicate that the optimal marginal distributions and copula functions of wind and solar power vary significantly across different regions．The probability and frequency of individual depletion of wind power or solar power in each region are relatively high．In contrast, the probability of extreme coupling events with simultaneous depletion of both energy sources is lower, accompanied by a significantly lower occurrence frequency．