Measure body surface temperature with uncooled infrared thermal imager has many features such as fast, non-contact, short scope of measurement and higher accuracy requirement. But temperature of core and environment will interfere the accuracy of micro-bolometer to a great degree. A new method was proposed to correct temperature error caused by the difference of temperature between calibration and measurement. The data of core temperature, environment temperature and grayscale were measured and recorded, and then error correction parameter was calculated by using SVM. In the course of measurement, the environment temperature and core temperature were obtained with thermocouple and sensor in micro-bolometer, and then error correction of environment temperature and core temperature were finished by error correction parameter. By this way more accurate data of human body surface temperature field were gained. Experimental results shows that the error of new corrected method can be decreased at least 50% when the distance of measurement is about 2m, compared with thermocouple of high precision which had been calibrated.