In order to accurately study the influence of calibration temperature on frequency domain reflectometry (FDR) capacitive soil moisture sensor measurement, to improve the consistency of the data of network measurement sensors deployed in different sites. According to the measurement range of capacitive soil moisture sensor, the temperature effect of reference frequency experiment scheme is proposed. The relationship between the frequency of the sensor and temperature in air and water media is obtained by experiment, and the relationship between air temperature and water temperature is also obtained through the experiment. Furthermore, the relationship between normalized frequency and water media temperature is derived with water temperature as independent variable. According to the air frequency temperature fitting equation, the number of frequency reduction 4. 860 5 Hz on average when the air media temperature rises 1 ℃ ; and according to the water frequency temperature fitting equation, the number of frequency increases 6. 615 5 Hz on average when the water media temperature increase 1 ℃ . There is an inflection point between the normalized frequency and the water calibration temperature function, When the soil moisture is higher than the inflection point, the normalized frequency increases with the increase of temperature, The higher the soil moisture is, the higher the normalized frequency. When the soil moisture is lower than the inflection point, the normalized frequency decreases with the increase of temperature, the lower the soil moisture is, the higher the normalized frequency reduction rate. Secondly, calibrate the soil moisture sensor with two typical texture undisturbed soil sample. Based on the calibration curve of the sensor, the relationship between the volumetric water content of undisturbed soil and he calibration temperature is derived. The result show that the maximum influence error of calibration temperature on the measurement of volumetric moisture content of undisturbed soil is 0. 12% cm 3·cm -3·℃ -1 , The measurement error of volume content in the temperature range of experimental is 5. 93%(cm 3·cm -3 ).