Abstract: A new method of searching the refuse-recognition algorithm is proposed,and the cost factor is employed to form the Fisher adjudgement function.The cost factor of correct-recognition and error-recognition is used in confirming the algorithm,which is the element of the Fisher adjudgement function.The method of independent component analysis(ICA) is proposed to extract some features of radar target high resolution range profile(HRRP),which is decomposed in the field of "base signals".The coefficients are extracted to form vectors as the target's feature vector.The K nearest neighbor(KNN) classifier is employed as the classifying rule,which is based on the Euclid's distance,and a new classifier is designed through adopting the refuse-recognition threshold.Experiment results show that the proposed method performs better and has the lowest cost.