[Objective] The changes and impact of regional ecosystem services and ecological risks were studied in order to provide decision-making support for the rational utilization of land resources and ecological restoration of territorial space.[Methods] Landsat remote sensing images were used with the random forest classification method of the GEE (Google Earth Engine) platform to extract land use change information for Kunming City, Yunnan Province from 1990 to 2020. A spatial dynamic change analysis was carried out based on the interpretation results. The equivalent factor method was used to estimate ecosystem service values. An ecological risk model was used to determine the change in ecological risk over time. The correlation between ecosystem service value and ecological risk was calculated with a bivariate spatial autocorrelation model.[Results] ① Among the land use types in Kunming City from 1990 to 2020, forest land and grassland occupied the largest area, the area of construction land increased significantly, and the area of cultivated land, grassland, and forest land decreased. ② The value of ecosystem services in Kunming City showed an overall upward trend over time, with a total increase of 3.08×10⁸ yuan. The effective implementation of ecological protection policies increased the value of ecosystem services. Ecological risks during the study period were mainly classified as medium and low risks, and accounted for 79 % of the total area. The overall average ecosystem service value decreased by 0.12, indicating that urban economic development had developed with little impact on the environment. ③ Ecological risk had a certain impact on the change of ecosystem service value, and with the passage of time, the area of high-value and high-risk areas gradually decreased, and the area of low-value and low-risk areas gradually increased, without obvious extremes.[Conclusion] The combination of regional ecosystem service value and ecological risk can better characterize changes in ecological environment of Kunming City caused by human activities, and provide decision-making and management references for environmental protection and high-quality sustainable development. effectively prevent ecological risks, and make the economic development and environmental protection of Kunming City develop to a benign situation.