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"Development of Active Noise Control System for Vehicle's Muffler" is developing an active muffler system capable of attenuating low frequency noise levels and simultaneously improving engine performance. Its concepts will utilize a digital signal processing computer, with a cancelling actuator connected to the engine via a straight-through pipe, to cancel unwanted engine exhaust noise. With fast clock speed of 20MHz, the DSP chip allows for rapid adaption to a car engine speed changes. Sensing devices located within the Active Muffler System detect exhausted noise generated by the engine. The sensing devices relay the noise, in the form of electrical signals, to the DSP computer. The DSP analyzes the incoming information and, in response, generates mirror image elecrical signals. These inverse signals are then introduced, through transducers, into the Active Muffler System canister. Within miliseconds, cancellation occurs. Through these cancellation process, considerable noise reduction will be attatined. In this study, active muffler was designed and manufactured for exhaust noise reduction of commercial vehicle, then simulation and experiment of real vehicle was conducted.