Beam quality and intensity are critical characters of high energy laser system. Accurately measuring the far-field laser beam spatial profile is an effective way to diagnose laser beam quality and study the atmospheric transmission effects for a high energy laser system. In this paper,a detector array system for mid-infrared laser beam profile measuring is developed. The system is consisted of optic attenuators,photoconductive HgCdTe detectors,amplifiers,analog to digital converter unit,wireless transmission unit,and data processing end. Considering the responsivity and resistance sensitivity of HgCdTe detector with temperature,a responsivity adaptive calibration model is proposed to solve the temperature sensitivity of HgCdTe detector. The system is capable for absolutely measuring far-field power density distribution of infrared laser with response wavelength between 1 μm and 5 μm,the dynamic range of power density which it can measure of above 103,the refresh rate of 25 Hz,along with the measurement uncertainty of less than 20% in the temperature range of -60-40 ℃.