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A control system of the grain return flow inside a head-feeding combine was presented in this paper. This system controls the grain return flow by changing the clearance of chaff sieve according to the amounts of the grain tank flow and the grain return flow that measured with two grain flow rate sensors. For the purpose, a grain flow model with respect of a separating process inside the head-feeding combine was proposed, and the parameters of transport delay times and distribution ratios of the model were identified by experiments. Indoor tests were conducted to control the amount of the grain return flow using the grain flow model. As the result, it was possible to control the grain return flow using the grain flow rate sensors in real-time.