Abstract: The bandpass colorimetric filter temperature measurement theory was presented, which could accurately measure the object at medium-low temperature, meanwhile, a series of experimental facility were built up based on the theory. The facilities used were calibrated accurately and the discrete data were fitted by using numerical function, a temperature-measurement experiment was done using extended blackbody in the range of 50℃~400℃. Experiment result implies that the facility can precisely obtain the true temperature of a measured objection without the presence of target launch rate. Therefore, it proves the validity of the theory and the feasibility of the temperature-measurement system matching the theory, which plays a key role in the accurate measurement of the medium-low temperature objects.