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A method for measuring the spatial three-dimensional coordinates of explosion points in the field is proposed, based on a two-dimensional PSD position sensor. A measurement system for determining the coordinates of explosion points in three dimensions using a two-dimensional PSD position sensor is constructed. Furthermore,a mathematical model for measuring the spatial three-dimensional coordinates of explosion points is established based on binocular vision principles. Calibration techniques for long-range passive detection systems in the field are studied. By decomposing and transferring system error,the errors of various parameters are analyzed. Error distribution graphs of the three dimensions of the explosion point's position coordinates are plotted in Matlab, and the distribution of measurement system errors with changes in the actual location of the explosion point is analyzed. Based on the error distribution graphs,the maximum measurement error for the X-coordinate is approximately 0.292 m-0.303 m, for the Y-coordinate it is approximately 0.251 m-0.371 m,and for the Z-coordinate it is approximately 0.270 m-0.336 m at a theoretical testing distance of 100m.Finally,the correctness of the measurement method,the feasibility of the calibration technique for the passive detection system,and the functionality of the measurement system are validated through static explosion experiments.The results demonstrate that the measurement system has a fast response speed and good functionality,the calibration technique for the passive detection system is operationally feasible,and the method is suitable for the rapid measurement of explosion point positions in the field.