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A control system of precision water disperser on the walking-type irrigation was designed based on advanced RISC machine (ARM) and Linux. The various kinds input signals were received by the system and were dealt with the embedded kernel of ARM. Then it provided the pulse signals of the step motor to control the valve opening. Finally, the purpose of precision water disperser was realized in precision agriculture. The experimental results prove that the control system has certain stability and can reach the anticipated effects.