Abstract: This paper deals with the method of optimal design by means of orthogonal array for parameters of active bandpass filters. Our optimal design is combined direotly with optimization for stability. For 40 midband fregunoies which are 19.9526, 25. 1189, 39.8107, … eto. We seleot out a set of optimal parameter combination respectively. Tolerance of the resistance is equal to 0.1%, tolerance of the capacitance is equal to 0.5%. Thus those filters consisting of commodities of above element possess better proporties than the national standard GB 3241-82 of the People's Republic of China.