According to the bomb falling point coordinate measurement of wide field under complex terrain conditions, a monocular vision measurement method combined with digital elevation model(DEM) was proposed. The object or scene information was not relied on in the method. The 3D coordinate of the bomb falling point can quickly be calculated with only one bomb fall image of single camera in the method. Firstly, the two-dimensional information of the image was used to solve the space linear that camera and the bomb falling point were connected; Then, according to the relative position of the camera and the target to determine the search starting point and step on the line, the line search and digital map of elevation were matched; Finally, the 3D coordinates of bombs were solved. Field test results show that when the distance between the camera and monitoring area is more than 500 m, and the width of the field of view is 300 m, the relative positioning error is better than 0.3%. The advantages of simple structure, low cost, fast operation speed, and is applicable to coordinate measurement of bomb falling point under complicated terrain conditions were proved in the method.的研究。