The interceptor collection method was used to collect arthropod communities from six small and medium-sized parks within the third ring road of Beijing to study the relationship between the diversity of arthropods and microenvironmental factors in urban green spaces and promote the stability of ecosystems in urban green spaces.Pearson correlation analysis，regression analysis，and principal component analysis （PCA） were used to analyze the relationship between the diversity of arthropods and their natural enemies and the microenvironmental factors in urban green spaces.The results showed that Aphididae was the dominant family in arthropods，accounting for 52.12% of the total abundance.Diaeretiella rapae and Semidalis aleyrodiformes were the dominant species of aphidophagus predator insects，accounting for 27.73% and 23.92% of the total abundance，respectively.There were significant differences in the richness，abundance，and Shannon-Wiener index of predator insects among different plots.The areas，richness and Shannon Wiener index of flowering plants were significantly positively correlated with the abundance of arthropods（P<0.001），the richness（P<0.001） and the abundance（P<0.001） of aphidophagus predator insects，and significantly negatively correlated with the Shannon Wiener index of arthropod communities（P<0.001）.The frequency and dosage ratio of pesticide application were significantly positively correlated with the abundance of arthropods（P<0.001）.The results of principal component analysis showed that the main microenvironmental factors affecting the diversity of arthropods in urban green spaces included the dosage ratio of pesticide，the area of flowering plant，the frequency of pesticide application，the evenness of flowering plants，the Shannon Wiener diversity of flowering plants，and the abundance of flowering plants.The results of RDA analysis showed that the area，evenness，Shannon Wiener diversity and abundance of flowering plants were significantly positively correlated with the abundance of arthropods and aphidophagus predator insects，and significantly negatively correlated with the diversity of arthropods.The results of comprehensive ranking showed that the top three factors with the greatest influence were the dosage ratio of pesticide，the area of flowering plant and the frequency of pesticide application.The microenvironmental factors and their impacts on the diversity of arthropods in urban green spaces were preliminarily clarified.It will provide references for promoting the protection of biodiversity in urban green spaces.