Using laser interference technology,computer control technology and data image processing technology,the CCD interferometer measuration system is designed.Then,the mathematical model between the interferogram and the tip-tilt angles is deduced.After preprocessing the interferogram and thinning the fringes,least square method is used to fit the fringes.Based on equal thickness interferometer theory,the tip-tilt angle parameters of the active mirrors are obtained.The X axis′s movement range is 56″.872,and the resolution is 0″.113.The Y axis′s movement range is 49″.835,and the resolution is 0″.112.