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To solve the problem that in the process of the irrigation can not according to the soil moisture of water control, the problem of serious water waste, designed and implemented based on XR234Q electronic noses and ARM7 farmland precision irrigation system. Using electronic nose module to collect information of soil moisture, soil moisture probe information extraction and isolation of interference, moisture level judgment model is established, using the least squares fitting was carried out on the water, control of irrigation water, cooperate with ZIGBEE network remote transmission of information, in the case of water demand maximum saving irrigation water. Experimental results show that the proposed system has moisture capacity for independent judgment and water consumption calculation, quick and accurate irrigation task, compared to traditional systems, this article system soil entropy sentiment detection error rate within 5%, water conservation capacity increased by 35%, the application prospect.