In this paper,using a copper cylindrical conical blackbody radiation source cavity,a F500high-precision thermometer and a TRTⅡ radiatio n thermometer, an icepoint thermostat blackbody radiation source and its performance test system are built,and experimental study on the uniformity and stability of the blackbody radiation so urce cavity temperature are completed.The experiment verifies the feasibility of applying the blackbody radiation source cavity under the icepoint thermostat to the infrared radiation thermometer calib ration and using the icepoint to conduct the value transfer.The experimental results show that t he stability of icepoint blackbody radiation source cavity temperature field environment is 0.001℃ within 30min,and the uniformity is less than 0.001℃.The stability of blackbody radi ation source cavity bottom is 0.03℃ within 20min,and the uniformity is not more than 0.024℃.It is verified that the icepoint can be used as a fixed point of the blackbody radiation source in an icepoint thermostat,which has a good performance,and can be used for the stability test ing and calibration of the infrared radiation thermometer at the icepoint.