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Applying HSL (hue, saturation, luminance) color model transformation technology, the research of pearl luster degree classification has been done, and the pearl image was disposed after transformed it from RGB color model to HSL color model. Then, according to the luminance message that has been received, fuzzy pattern recognition method was adopted to distinguish and classify, and at last the classification of pearl luster degree was realized. Afterwards, by giving correction and instruction, aiming at the evaluation method, the method was further perfected and its applicability was improved.