Abstract: The existing algorithm against deception-false-target by homogeneous radar system is single due to the simplicity of configured mode. To solve the problem, a method against deception-false-target based on isomerous netted radars is proposed. The isomerous netted radars in this paper consists of 3D radar and 2D radar. The distance and azimuth information between target and 2D radar are estimated by making use of the measurement of 3D radar. By comparing the estimated values with the measurements of 2D radar, the false-target can be discriminated by using chi-square statistics. We further analyze the influence of the distance of deception distance, observation frequency, the 2D radar accuracy on algorithm's discrimination probability. Simulation results show that the proposed method is efficacious in discriminating the false-target jamming.