Abstract: A new high-precision assembly technique by combining traditional turnery technique with computer assisted assembly, in an attempt to meet the strict requirements on centering errors of high-precision standard lens, was introduced. First, the tilt-errors of optical axes were managed by turning centering initially, and then with the assistance of high-precision centering errors measurement，shift-error alignment for each lens was conducted. Last,through simulating the optical axis space state by computer，the ration abrade for circle was done precisely at given angle so as to control the tilt-error between each lens.The result indicates that by using this technology, the tilt-error of the lens is less than 5 and the shift-error is within 3 m, thus the design objectives are met.