The active noise control (A N C) is the technology developed with the digital signal processer. Up to the present, so much technique have been introduced into the noise control in the various fields. Therefore, in this study, in order to apply the A N C to the agricultural machineries, the noise and vibration characteristics of the Japanese head feeding combine were investigated. Moreover, feedforward control technique which is one of the methods of the A N C, was introduced into A N C system. In this paper, desirable reference signals which are similar to noise around the ear of the operator, were investigated. As a result, reduction effect of the noise was calculated and consequently, the desirable reference signals diminishing the noise were obtained as follows; 1) Vibration acceleration signals of the sub-frame in the direction of the front and rear of the engine. 2) Noise signals around the air intake. In the future, if the multi channel control can be performed, so much reference signals which have correlative spectrums partially, will be available for the system of the A N C.