The present measure technologies of laser power is is difficult to meet the measurement requirements of the superficial power of targets produced by high energy laser device.An indirect method embedded FBG (fiber Bragg grating) sensors for measuring the superficial power on targets produced by high energy laser is proposed in this paper.Two FBG sensors are embedded in different depths of the target,to realize accurate measurement of temperature changes at different depths within the target.By curve fitting the temperature difference of the two FBG sensors,the superficial power of targets produced by high energy laser can be measured indirectly.The result of simulations indicates that the proposed method in this paper is effective and accurate,and can indirectly measure the superficial power of targets produced by high energy laser,which is not limited by wavelength and power level.