Abstract: The sensor sensitivity of laser energy meter at present is related to the ambient temperature and varies considerably in the range of -50℃～70℃ which influences the measurements directly. To eliminate the influence of ambient temperature，this paper describes the sensitivity calibration method for pyroelectric energy meter at different ambient temperatures. First of all，the energy meter is put into the environment test chamber and the temperature point is set every 10℃ in the range of -50℃～70℃.Next the sensitivity correction coefficients at different set temperature points are calculated. The function between the sensitivity correction coefficients gotten above and the ambient temperatures is established and the other sensitivity correction coefficients at different temperature points are deduced by least square method. In real ambient environment，the sensitivity coefficient is calculated according to the function between sensitivity coefficient and ambient temperature to realize accurate measurements of laser energy in non-regular environment. The developed pyroelectric laser energy meter which can work in non-regular environment solves the problem of laser energy measurement in field.