DIC (digital image correlation) can directly measure the mechanical behavior of rock mass surface, and detect the failure form, failure location, area and development trend of rock mass under external force by measuring the displacement and strain characteristics of rock and soil surface. It provides a reliable scientific research tool for material and structure safety assessment of engineering construction, and is widely used in rock and soil triaxial compression test. Geotechnical splitting test, slope vibration test, 3D printed concrete material and structure test, recycled concrete structure test, construction engineering material test and other fields. The DIC technology is used to analyze the full field deformation of rocks, local such as the deformation of rocks, and the evolution process of shear zones.