Abstract: To investigate the optimal capacity ratio for various parts of a wind-PV-storage integrated project,this paper takes an industrial park in Bayannur City,Inner Mongolia Autonomous Region as a case study.Based on the new load added to the industrial park and its wind energy and solar energy resources,calculated the hourly throughout the year and the typical daily output power curves for each month for wind power and PV power generation. Then,a capacity ratio plan for wind and PV power generation is obtained under the condition of meeting the electricity demand for the new load added to the industrial park. In light of the intermittency and volatility of wind power and PV power generation,energy storage are introduced to smooth the output power curves,ensuring that the power generation capacity curve of the wind-PV joint power generation matches the change trend of the industrial park’s load electricity consumption curve. To enhance the green electricity substitution rate of the industrial park and reduce the amount of abandoned wind-PV joint power generation,analyzed the impact of different capacity ratios on the consumption of wind-PV joint power generation and the green electricity substitution rate,and identified the best solution. This study offers an effective capacity ratio calculation method for wind-PV-storage integrated projects in industrial parks in the Inner Mongolia Autonomous Region,which is conducive to optimizing the operational efficiency of the projects and promoting the widespread application of green energy.