Abstract: Insitu monitoring experiment was carried out in combination with the slope of the LixianXiaojin Highway in Sichuan province seismic area. In the period of monitoring, three earthquakes whose magnitudes were more than 48 grades occurred in this area. Based on the monitoring results, the main conclusions are as followed. The deformation of overall of the surface rock structure has a process of rapid increase, which indicates that the construction still produces the largest affect on the loose deformation of rock slope in this seismic area. The deformation had attenuated for about 2 months, and then tend to be stable. For reverse structural surface, the rock structure of slope surface would also produce compacted deformation by earthquake, which was conducive to the stability of rock slope. The change in horizontal displacement was frequent, which was related to its location, load and seismic excitation. It is necessary to set up retaining walls under the slope. Moreover, the latter observation data indicates that the slope has been basically stabilized.