Abstract: To address the source-load imbalance issue in capacity allocation schemes based on source-load matching characteristics, an optimization configuration method for large regional composite power stations based on source-load matching is proposed.Firstly, this paper constructs the indicators of source-load matching characteristics and analyze the source-load matching characteristics of the region, and then aim to optimize economy and the indicators of source-load matching characteristics to construct the regional large composite power station configuration model considering the source-load matching, and finally obtain the configuration scheme of large composite power station. The analysis shows that with the optimized ratio of wind, solar and traditional power supply, the construction of large composite power station improves the source-load matching degree of the system, reduces the peak-to-valley difference of power system load in each operation scenario, relieves the regulation pressure of traditional power supply, and provides a referenceable capacity configuration scheme for the steady replacement of traditional thermal power by renewable energy.