Five factors are identified, which affect the performance of optical filter: 1) type of opticalglass, 2) existence of Fe, 3) photo pic coating type, 4) coating form, and 5) coating thickness. If weconsider all the levels of five factors, there are 360 possible candidates. We determined five evaluationcriteria, which can be used to evaluate possible candidates. For the performance measures we selectedwhite-state avearge voltage, black-state average voltage, and black-state error rate. And we addedeconomic criterion and quality and maintenance criterion. Through the two-step statistical analysis ofwhite-state avearge voltage, black-state average voltage, and black-state error rates, we selected finalfour candidates. Based on the five criteria we finally determined optimal optical filter using AHP.