Abstract: The left engineering slope of Dadu River where GNSS deformation monitoring points were installed has experienced the '9·5' Luding earthquake(the main shock) in 2022 and its aftershocks, which provides valuable data for the deformation response analysis of engineering slope under the action of earthquake. On the basis of sorting out the earthquake background and disasters, the deformation duration data of monitoring points on the slope gravelly soil and bedrock were sorted and analyzed, and the following main findings are obtained. Under the excitation of the main earthquake, the horizontal deformation of gravelly soil is generally S-shaped, and there are pre-earthquake stable section, post-earthquake growth section and post-earthquake convergence section, and the horizontal deformation of gravelly soil in the post-earthquake growth section increases by 20 mm. The aftershocks with a smaller magnitude than the main shock have no significant substantive impact on the horizontal deformation of gravelly soil in the post-earthquake convergence section, which is very similar to the "Kaiser effect" in the acoustic emission phenomenon. The horizontal deformation direction of gravelly soil excited by the main earthquake increased rapidly and substantially from 8.5°north by east to 30.5°north by east, but this change in the horizontal deformation direction of gravelly soil has elastic resilience. The horizontal deformation response of slope gravelly soil under seismic action is more significant than that of bedrock, and the analysis shows that the difference between lithology and slope is the main reason for the difference between them. The vertical deformation of slope gravelly soil and bedrock and the horizontal deformation of bedrock have no significant changes under the earthquake. The latest deformation data show that the slope at the monitoring point is in a relatively stable state. In view of the potential adverse effects of complex factors on the slope, the dynamic stability analysis and judgment of the slope should also be carried out based on multi-source monitoring data. The research results can provide some reference for the safety construction of slope and disaster risk prevention and control during earthquake.