通过对丽江地区构造格架和丽江大震的震后调查 ,对丽江地震的发震环境进行了系统分析 ,认为丽江地震是在主压应力为近NS向区域应力场作用下 ,NE向丽江 小金河断裂左旋错动和NW向中甸 永胜断裂右旋错动 ,从而导致巨甸—九子海三角形断块东部近尖端部位出现局部拉张环境 ,最终导致近NS向西倾的玉龙雪山东麓断层北端撕裂而发震 . Through the investigation of the tectonic framework of Lijiang area and the post-earthquake survey of the Lijiang earthquake, the seismogenic environment of the Lijiang earthquake was systematically analyzed. It is considered that under the action of the principal compressive stress near the NS to the regional stress field, The L-shaped fault of the river fault and the dextral movement of the NW to the Yongsheng fault of Zhongdian, resulting in a local pull-out environment near the tip of the eastern part of the Judian-Zhuangzi delta fault, eventually leading to the Yulong Snow Shandong The northern foot of the fault tearing and seismogenic.