The object of this paper is to develop optimal optical filter, which can be used to identify thefinancial account and read the information. The five factors which affect the performance of the opticalfilter are identified as optical glass type, existence of Fe, Photo pic coating type, and coating form. Inthis study we seek to determine the optimal combination for the best design of the optical filter. For eachcombination, the performances of optical filter are investigated using the proper experimental equipmentsand methods. White-state voltage, black-state voltage, and black-state error rate are used for theperformance measures. Through the statistical analysis of the performance data collected, we havedetermined the optimal design of the optical filter.