This paper studies the influence of the process parameters of automatic liquid sand blasting on the thickness of the material substrate and the surface of the blade of the turbine rotor blade of aero-engine,analyzes the accuracy of the method for measuring the amount of material substrate removed after sandblasting,collects the surface parameters of the blade before and after sandblasting by blade multi-axis rotating overspeed measuring machine,imports the CAD standard digital mode,forms a chromatography in the software by comparing different digital models,which intuitively reflects the change of the surface shape of blade after sandblasting.