This paper mentions the recent development of combustion control technology and describes some results on theactive combustion control system for suppressing flame instabilities. As for the combustion control technology, there arethree typical elements including their coupling effects; thermoacoustic, heat release and fluid dynamics. In this research,development of the active combustion control system is carried out experimentally, which is based on a thermoacousticcontrol and a flame structure control. As the thermoacoustic approach, a feedback control system using a loudspeaker isdeveloped, and furthermore a flame structure control system is also investigated using a secondary injection method.Both results of the thermoacoustic and the flame structure control show a good performance of suppressing the pressureoscillation.