In this study, 4 different types of soil moisture sensors with different operating principles were employed to conduct a half-year com - parative analysis at Shangzhuang Experimental Station in Beijing. Based on the monitored data, analysis of soil moisture sensor ’s stability, sensitivity and accuracy were carried out. The results show that each type of the sensor exhibits its own advantages and disadvantages. In gen - eral, all types of the sensors exhibits good stability and good reaction to precipitation. The accuracy of the 4 types of sensors show little difference, by fluctuating around the value of oven drying method. This comparative analysis will provide a reference to understand the performance of different soil moisture sensors, and then promote their wide application.