Abstract:The fault motion coordination ratio method can be applied to analyze the crustal strain accumulation in Yunnan area. Based on the observation data of 11 cross-fault flow monitoring sites for more than 30 years, the three-dimensional activities on the sites were first calculated, and then the coordination ratio parameters of fault activity were obtained. The results showed that:(1) The sites of Lijiang, Yongsheng, Jianchuan, Shiping, and Jianshui have good reflecting effect to historical earthquakes with magnitude 6-7. There are anomalies in the sites of Jianchuan, Shiping, and Jianshui recently, and the strain accumulation and abnormal fault activities are show along the Jianchuan and Shiping-Jianshui faults; (2) Combined with the original cross-fault observation data and the three-dimensional activity time series curve, it is considered that the crustal deformation anomalies are distributed in Jianchuan, Xiaguan, and Yongsheng of northwestern Yunnan, and near Eshan, Shiping, and Jianshui of central Yunnan; (3) It is considered that after the Jiuzhaigou M7.0 earthquake in Sichuan Province, the stress accumulation in southern part of the North-South seismic belt may be accelerated, so more attention should be paid to the risk of moderate and strong earthquakes in Yunnan.