After the explosion, in order to rescue the ocean engineering in a timely manner, the explosion point position needs to be accurately located. In order to improve the accuracy of positioning the spatial coordinates of the explosion point, after studying the characteristics of the shock waves, a method for positioning the spatial coordinates of the explosion point is proposed. The current method corrects the average velocity of the shock waves, and the effectiveness of the method is also tested by examples. The principle of this method is: through the overpressure empirical formula to obtain the burst distance R corresponding to each measured point, the distance from the coordinates of one point in space to each measurement point is r, the shock wave average velocity correction factor is K, which could be adjusted to improve the accuracy of the positioned result; and when the total relative errors of each measured point are the smallest, which is the coordinate of the positioned explosion point. The example results show that the accuracy of the coordinates of the explosion point is high. And based on the characteristics of the shock wave, a spherical charge data processing method is proposed, which can effectively improve the accuracy of position. By using it, the coordinate error of the explosion point is reduced from 0.66 m to 0.08 m, the relative error of the explosion point is reduced from 6.68% to 0.86%, and the maximum relative error of K is reduced from 4.95% to 0.31%. The coordinate error of the cylindrical charge example was 0.31 m, the relative error of the explosion point is 14.75%, and the maximum relative error of K was 11.55%. The error of the original data has a great influence on the position accuracy, and in order to ensure the high accuracy of the position result, the data with excessive error should be excluded.