The invention discloses a method for determining a radar target characteristic measuring synchronous scattering point area of a compact range. The method comprises the following steps: building a three-dimensional rectangular coordinate system in a dark chamber of the compact range; determining position of a feed source of the compact range in the three-dimensional rectangular coordinate system; determining position of a reflective surface of the compact range according to the position of the feed source of the compact range and position of a test area; taking the position of the feed source of the compact range as a circle center and taking a furthest distance and a shortest distance generated when reflection wave of the feed source of the compact range is reflected by the reflective surface of the compact range and directly arrives at a target to be tested in an area to be tested as semi-diameter to build two spherical surfaces in the dark chamber of the compact range; forming a synchronous scattering point area by using the two spherical surfaces and a space between the two spherical surfaces. The method can be used for quickly finding a maximum synchronous scattering point area in the compact range with scattering signals which have interference effects and arrive at the feed source of the compact range simultaneously with scattering signals of the target to be tested.