Abstract: The method provided by Technical Specification for Concrete Dam Safety Monitoring would lead to error conclusion in temperature constants checking of the differential resistance sensors.Study indicated that it was because the incorrect values of temperature coefficients α and β.The conclusion obtained from an experiment indicated that α and β now were different from the old ones which recommended by the specification and they cann＇t be used to check the temperature performance of the sensor,but they can be obtained by regression analysis in the temperature experiment．