Abstract: The loose materials movement caused by earthquakes and secondary geohazards endanger residents and threaten the ecological environments. In 2017, the Jiuzhaigou earthquake had produced large amounts of loose materials (colluvial materials) that were still present on the steep slopes and in the valleys. The colluvial materials had aggravated the risks of future geohazards and caused siltation in the Jiuzhaigou Reserve; strong rainfalls can eventually develop devastating debris flows. In response, this research seeked to calculate the volume of earthquake-triggered colluvial materials and analyzed their spatial distribution patterns to help to implement proper early warning systems, prevent, and mitigate geohazards and prevent siltation in future. For this purpose, the researchers applied the DInSAR technique, remote sensing, and conducted some field trips to detect the surface deformation, calculated the volume and spatial distribution patterns, and interpreted their findings. Results showed that the Jiuzhaigou earthquake produced large deformations on the northwest of its epicenter, and small deformations on the southeast of the epicenter, ranging from -23 cm to 11 cm in the satellite Line of Sight. Results revealed that the earthquake-triggered colluvial materials in the Jiuzhaigou Reserve have zonal distribution features, mainly distributed along the roads and valleys, especially in the Wuhuahai area, with a calculated volume of 1.658×105m³. In fact, these findings had great significance for the mitigation on geohazards risks and lakes siltation in Jiuzhaigou Reserve.