Abstract:In order to solve the problem of insufficient applicability of traditional soil water sensor calibration methods under different soil bulk density, resulting in low sensor calibration accuracy and soil water content monitoring accuracy, according to the soil bulk density of the vertical profile, the sand ginger black soil of Huaibei Plain was divided into three groups. Follow-up calibration was carried out for the three layers of 20~50 cm, 70~ 100 cm and 120~ 150 cm, and compared with the soil water ratio of the unlayered soil.Layered vs. non layered methods,The relative error of the volume moisture content of the corresponding three soil layers is reduced from -11.48%~-2.97% , -2.85%~10.29% , - 1.58%~13. 14% to ±7.9%,±6.9% and ±6.1% respectively, and the average value of multiple errors is reduced from 1.38%,1.25% and 2.8% to 0.61%,1.24% and 2.22% respectively.The results show that the proposed calibration method of soil water sensor based on weighing method has higher calibration results, efficiency and accuracy than that of soil water sensor without stratification, and the calibration method is more scientific. It provides a more effective means for soil moisture monitoring and modern agricultural production.