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To improve the long-distance transmission of command information systems wired interface test automation level, proposed the signal automatic identification method based on the type of signal feature extraction. On the basis of various types of interface signals in time domain and frequency domain characteristics analysis, the use of limiting filtering method to achieve peak to peak signal accurate judgment, for signal spectrum by Burg spectral estimation method based on AR model algorithm for accurate estimates. Based on the extracted signal peak to peak and bandwidth, dual threshold decision method for automatic recognition interface categories. Experimental results show that the automatic recognition method characterized in the frequency domain based on the difference signal, can effectively distinguish three types of 15 interfaces, recognition accuracy reaches 87%.