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Abstract: To identify the out-of-database targets in the process of radar ground target recognition with High Resolution Range Profile (HRRP), this paper proposes an improved radar ground target identifier based on the distribution of the space of training features. In the training phase, a K-Means clustering strategy based on the pre-process of correlation coefficient is utilized to divide the space of training dataset. Then each sub-space boundary is determined by Support Vector Domain Description (SVDD) based on the distribution of the sample space. Finally, it can decide the category of target with the sub-space boundary and the weighted K-neighbors principle. This method can work without the template of out-of-database samples, which improves the effectiveness of target identification. Due to the fact that the feature space of different targets has the characteristic of non-uniform aggregation under different attitudes, a procedure of region partition is applied to training dataset. Thus computational load is relieved with a decrease in search operation of template matching. The requirement of real-time processing can be satisfied. Finally, the experiments against both simulation and real data verify its excellent performance of identification and real-time processing capability.