In this paper, a new grain moisture detection system is designed based on capacitive sensor. Comparing with the traditional methods, it can not only improve the detection accuracy of grain moisture, but also improve the grain automation degree in the drying process. Although the capacitive sensor with detection circuit can detect the capacitance value of grain samples, only the capacitance value detected to determine a parameter of water is not accurate. Because the capacitance moisture detection is influenced by many factors such as temperature, variety, quality, etc.. Only to conduct the comprehensive analysis to deal with these factors, the detection accuracy of moisture meter can be improved. In later studies, the depth analysis
will be conducted on the factors which impact the measurement accuracy, and further enhance the robustness of the system to achieve more ideal results.