Objective:To evaluate the quality of Yigan Granules prepared by different technology through finger print chromatograms and patting recognition.Method:SBE has been used for the preparation of Yigan Granules.HPLC has been used for the finger print chromatograms of different samples.Principal component analysis,cluster analyses and stepwise recognition analysis have been used for the pattern recognition.Results:All the 15 samples have been divided into 10 classes and each with a recognition function.The accur...