This paper is to present a selected method of circuit parameters in the inverter part of the electronic dimming ballast fer fluorescent lamps, that is adffIuate to use with the prevailing dimming controller IC. Through the experirrent result using the prototype of the electronic dimming ballast rroduced by this rrethod, its validity is verified from the electrical and light outplt characteristics on fluorescent lamps. Also, it is feasible to rerrnte automatic and passive control for dimming electronic ballast as using a micrqrocessor, and we easily recognize the lamp condition owing to rmke a program indicate abnormal behavior for fluorescent lamp at PC screen.screen.