The present invention relates to a monitoring method, in particular to a low altitude target monitoring method. According to the present invention, a phased array radar antenna of which the pre-elevation angle is plus 15 degrees is used, in each pulse cycle of the antenna azimuth mechanical scanning, 8 beams of progressive full-covering electric scanning radar wave pulse signals of which the pre-elevation angles are between minus 15 degrees and plus 15 degrees are emitted out orderly relative to the normal direction of the phased array radar antenna, and according to an echo signal of a radar, the space coordinates of an object relative to the radar are detected. The monitoring method of the present invention can search and track the aerodynamic objects in the low-altitude airspace of which the altitudes are 3000 meters or less, such as the miniature airplanes, the paragliders, the unmanned aerial vehicles, etc., realizes the low-altitude blind compensation to the remote air traffic management primary radar, and forms the three-coordinate motion situation of the low-altitude objects.