Abstract: Blind source separation is a new technique that has been developed greatly in recent years.it is used to recover source signals from their mixtures.As a new technique,it has been applied in many fields.By the fact that high order cumulant is insensitive to white Gaussian noise,we give out a method for selecting radar signals based on blind source separation in this paper,This method can select radar signal from the mixture of multiple signal in white Gaussian noise context.At last,the simulation for this method is given in this paper.Simulation result have shown the validity of this method.