We choose 238 events recorded in the seismic stations of Ximalaya array(103 stations) and fixed stations(16 stations) with magnitudes from 5.8 to 8.0,and selected 5558 receiver functions with high signali-to-noise ratio and clear waveform,to calculate the depth of Moho and the crust poisson's ratio through the method of manually reading the time of seismic phase. The results show that the thickness of the crust presents a tongue-shaped protrusion to the southeast. The crustal thickness and poisson's ratio in the northwest Yunnan region varied significantly. After fitting,the crustal thickness under the mostly seismic station is positively correlated with the local altitude. The faults play a controlling role in regional structural characteristics and the change of deep dynamic environment. The north of Lancangjiang Fault and Nujiang Fault may be the passing channel for the material from Qinghai-Tibet plateau to extrude laterally to Sichuan and Yunnan. Rheological material exists in the deep of Lijiang-Xiaojinhe fault.