本文给出固体电导率与含水率之间归一化线性数学模型。不同物质的线性化模型仅斜率和截距不同，只要校正即可实现通用性，这与历史认识有差异。测量仪利用网络理论解决了高阻测量问题；利用线性叠加原理实现了温度补偿并提高了测量准确度；利用单片机对模型进行编程计算和校正，从而实现了智能化；采取隔离、滤波、ＷＴＤ等技术，提高了系统的可靠性。 This paper presents a normalized linear mathematical model of solid conductivity and moisture content. The linearized models of different materials differ only in slope and intercept, as long as they are calibrated to achieve universality, which is different from historical understanding. The measuring instrument solves the problem of high resistance measurement by using the network theory; realizes the temperature compensation by using the principle of linear superposition and improves the measurement accuracy; and realizes the intelligence by using the singlechip to program and calculate and correct the model so as to realize the intelligence; and adopts isolation, filtering, WTD and the like Technology, improve system reliability.