On the basis of the broadband data of regional seismic stations from the Sichuan Seismic Network and the mobile seismic stations，the receiver function inversion method was adopted for studying the characteristics of crustal flow and dynamic effects in Sichuan and its adjacent area． The results showed that the crust and upper mantle velocity in the Sichuan basin is significantly higher than the eastern edge of the Qinghai-Tibetan plateau． The earth’s crust velocity vS is from 3． 6 to 3． 8km / s，and the upper mantle velocity vS is from 4． 0 to 4． 5km / s． And there is no low-velocity layer in the crust． The lithology showed a nature of strong block． In the eastern edge of Qinghai-Tibetan plateau，the velocity vS is in low speed，the average velocity vs in earth’s crust is from 3． 0 to 3． 4km / s，and the upper mantle velocity vS from 4． 0 to 4． 5km / s． Low-velocity layer appear frequently in the crust． Most of the low-velocity layers are located in the intermediate crust with the depth of 20km to 40km． A small number of low-velocity layers appear in the upper crust of 10km ～ 20km and lower crust of 40km ～ 60km． Affected by the Indian Plate northward，the eastern margin of the Qinghai-Tibetan plateau moved in the eastward direction． It was blocked in hard Sichuan Basin． The movement is in the southeastward and southward direction． The movement process is produced by the complicated force in the research area． Because of this，the eastern margin of the Qinghai-Tibetan plateau become complicated geological structure and intense seismic activity area． Low speed crustal flow by strong Sichuan Basin barrier is delaminated into two or three shunts upward and downward． The shunts into upper crust uplift the surface，forming steep peaks． The downward flow intrudes into lower crust and the upper mantle． It makes the crust thickened and Moho sinking． Crust flow is mainly distributed along the active faults of the eastern margin of the Qinghai-Tibetan plateau． In the eastern margin，mainstream flow is from central Qiangtang block，and along the NW-SE direction along the Xianshuihe fault，then turned south and has two branches: a southward branch along the Anninghe fault and Xianshuihe fault，the other along the Nujiang Ｒiver fault，Lancangjiang Ｒiver fault zone to the south． In the research area in the north，there is a NE and EW crustal flow to the Longmenshan Mountain fault．