In order to measure the temperature distribution of electrically heated thin rod in axis quickly,we successfully developed a scan-pyrometer with wide temperature range.The system consists of a fiber color pyrometer and a scan optical detector.The systems′ parameters are that measured temperature range is from 800 to 3500℃;accuracy is less then 1%;the fastest response time is 10μs;scan angle is 40°.At the same time,the system has other functions,such as optics collimation,fiber transmission,the highest temperature displayed in figure,the temperature distribution drawn in figure and RS232 outer interface.