Abstract: Explosive load is the basis of anti-shock design and analysis for ships, and the explosive shock wave is a key physical quantity to characterize the explosive power. In the underwater explosion test, due to the distortion of the PCB138A50 tourmaline underwater sensor in the high frequency band, the free field pressure signal of the underwater explosion has a rising edge and peak distortion. When the horizontal distance between the explosion source and the measuring point far greater than the depth of the measuring point, the influence of reflected wave on the signal received at the measuring point needs to be considered. Generally, the water surface will be truncated and humps appear. These all cause errors in calculating the shock wave energy of the pressure signal, and then affect the anti-shock analysis of ship. In this paper, the method proposed by Jensen is used to correct the peak value, and the Cole function is used to fit and correct the shock wave. Through comparison, the shock wave energy corrected by the Cole function fitting method is closer to the theoretical value of the shock wave energy of the test explosive than that corrected by the traditional exponential fitting method.