Abstract: In order to quickly evaluate the operation status of common landslide control projects in service and take scientific and effective maintenance measures. The author investigated more than 160 anti-slide retaining walls, anti-slide piles, and lattice anchorage projects in the Three Gorges Reservoir area, Wenchuan earthquake area, and East Sichuan, obtained first-hand data of the above three types of landslide prevention and control projects. The deformation and failure modes and characteristics are summarized, the concept of landslide control engineering defects is defined, and the classification standard of defect degree is qualitatively put forward. Based on statistical analysis of damage characteristics of landslide prevention and control works, 10 control indexes are selected as the defect classification indexes, such as wall slip distance, wall settlement displacement, wall inclination, wall crack density, pile inclination, pile shear degree, pile crack density, maximum crack width of lattice beam, crack rate of single lattice beam, and proportion of damaged lattice deformation zone. Combined with the multiple linear regression method, the comprehensive quantitative evaluation of single engineering structure is carried out, and then a semi-quantitative health evaluation method for landslide prevention and control engineering is established.