From principle of the measurement of lenses’ power using Moiré Deflection Technology (MDT),formula of the relationship between moiré fringes’ tilt angle and lenses’ power was presented. After a series of experimental study,moiré fringes of the test lenses were obtained. Meanwhile,based on the character of moiré fringes,appropriate digital image processing such as gray scale equality,image enhancement,image thinning etc. was done,and distinct skeleton lines of the moiré fringes were provided. In the end,through proper data processing,measuring results of different lenses’ power were given,and they were compared with the measuring results tested by focimeter. Results show that adopting proper digital image processing methods for measurement of lenses’ power using moiré deflection technology has high precision.