The paper addresses the realization of anti-stealth radar and the problems which modern radars are confronted with. With the application of spread spectrum technology to radars, the capability of anti-stealth and anti-jamming is improved. Signal-to-noise (SNR) of the receiver increases through raising the launching power. Intercept probability decreases by transmitting multiple PN codes. Range of radar detector increases on condition that the intercept probability is unchanged. Simulation results show the validity of the proposed method.