Abstract: In the two independent odor treatment system in Beijing Cigarette Factory,the volume of moist gas exhausted from the primary processing line and the capacity of the odor treatment system were not in proper balance,it resulted in considerable energy waste. Therefore the systems were modified. The two independent systems were integrated into one. By regulating the fan motor's frequency and switching between main system and standby system,the odor treatment capacity was always kept in line with the volume of moist gas exhausted from the primary processing line. The application results showed that,the odor treatment system was reasonably regulated and controlled following the variation of exhaust volume from primary processing line and the on or off of each process step,power consumption decreased from 15000 to 8000 kW·h/month.