Abstract: Since there’s no standard high energy laser(HEL) calorimeter or standard laser beam, conventional methods can’t be used to calibrate HEL calorimeter. A method using existing small calorimeter for calibration with uncertainty transfer in measurements was introduced, and a way utilizing energy equivalence theory to calibrate HEL calorimeter was suggested. Uncertainty transfer method is convenient, but it has many courses, which result in great uncertainty of the HEL calorimeter. Equivalence method includes electricity-calibration and light-calibration. Electricity-calibration requires preciser design but easier data processing. Light-calibration needs no specific design, but the remainder caloric of lamps and the caloric loss must be measured before calibration. The three conditions of equ