Abstract: This paper introduces the usage and computer analysis methods of fingerprint spectrum of traditional Chinese medicine, and the design p rocess and implementation methods of pattern recognition system. It mainly discusses the key technologies of the system, including storage and recognition methods of finger print spectrum, explains the evaluation parameter of overlap ratio of chromatogram peak in finger print spectrum, introduces the evaluation model, and sets the recognition standard which contains three levels, including below 40％, 40％ to 70％, above 70％. At last, Sinkiang arnebia roots were taken as identification standard to identify two kinds of unknown arnebia root samples and the system was verified.

Key words: traditional Chinese medicine, fingerprint spectrum, da ta storage, similarity evaluation