Abstract: In measurement for laser power and energy，the ambient temperature of military laser measurement in field is different from the laboratory temperature. The sensitivity of laser energy meter sensor is relative to ambient temperature. If laser energy meter is not calibrated for temperature sensitivity, the measurement results will be affected greatly. Aiming at the problem, the paper proposes a new method in which the laser energy meter is put in temperature control box and the output pulsed laser is divided into two beams after beam splitter. The transmitted beam is accepted by standard energy meter or field laser meter, the reflected beam is accepted by reference energy meter and the calibration is done in temperature range of -50℃～70℃. The principle is verified by experiments and the results are analyzed. The function of sensitivity coefficient relative to temperature, which enables the accurate measurement of energy meter under nonstandard scenario. It provides a new reliable method for the study of calibration technology in field for laser energy meter.