Based on the known fault distribution in Sichuan-Yunnan region (SYR), a rigid Euler rotation model is constructed by using GPS velocities (1998 ~ 2016) after excluding the stations near the fault boundaries and simultaneously a translation-rotation-strain model is constructed by using almost all GPS velocities to calculate three periods strain rate fields (2008.6 ~ 2010.4, 2010.5 ~ 2013.4 and 2013.5 ~ 2016.12) after Wenchuan earthquake. The results show that: (1) the strike-slip activity is the most common trends for the regional faults. The Xianshuihe-Xiaojiang fault, the Lancangjiang-Weixi-Weishan-Wuliangshan fault and the Longmenshan fault are the most active in the whole SYR, and the dislocation rate is more than 15 mm/a, and the trend of activity gradually decreases from the northwest to the southeast. (2) The different activity rates of the faults in the study area indicate that some of the eastward extrusion of the Tibet Plateau is absorbed and adjusted by the inside faults, and it is not a few large strike-slip faults. (3) Through the analysis of three periods’ grid velocity fields, we found that the movement rates of the Bitu section of Lanchangjiang fault, the Northwestern section of Weixi-Weishan fault and the Nujiang fault after Wenchuan earthquake are larger than that after Yushu and Ya’an earthquake, and the difference is about 8 mm/a. Besides, the activity rate of Northwestern section of Longmenshan fault after the Wenchuan earthquake is larger than that after the Ya’an earthquake, although the two epicentres distances are relatively close. (4) The strain rate fields and surface expansion rates show that the high value area is mainly distributed at or around the intersection among some fault zones and its surroundings, and the maximum area is mainly located at some long and deep fault zones such as the Longriba fault, the Longmenshan fault zone, the Ganzi-Yushu fault and the Xianshuihe, and the magnitude is about 35 ~ 50 nanstrain/a. The research should provide fundamental material for the study of crustal stress variation and earthquake prediction in Sichuan-Yunnan region.

以川滇地区已知断层分布为基础，排除断层边界附近台站，利用GPS速度（1998~2016）构建刚性欧拉旋转模型，同时构建平移-旋转-应变模型利用几乎所有的 GPS 速度计算汶川地震后的三期应变率场（2008.6~2010.4、2010.5~2013.4 和 2013.5~2016.12）。结果表明：（1）走滑活动是区域断裂最常见的趋势。鲜水河-小江断裂、澜沧江-渭西-微山-无量山断裂和龙门山断裂在整个SYR最活跃，位错率超过15 mm/a，活动趋势从西北逐渐减弱到东南方。(2)研究区断层的不同活动率表明，青藏高原向东挤压的部分被内部断层吸收和调整，并非少数大型走滑断层。(3) 通过对三期网格速度场的分析发现，汶川地震后澜沧江断层碧土断层、威西-微山断层西北段和怒江断层的运动速率大于玉树、雅安地震，相差约8毫米/年。此外，汶川地震后龙门山断裂西北段的活动率大于雅安地震后的活动率，但两者的震中距离相对较近。(4) 应变率场和地表膨胀率表明，高值区主要分布在一些断裂带与其周围的交汇处或附近，最大区域主要位于一些长而深的断裂带，如龙日坝断裂、龙门山断裂带、甘孜-玉树断裂和鲜水河，震级约为35～50 nanstrain/a。该研究可为川滇地区地应力变化研究和地震预报提供基础资料。