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Categories thinking as an important mathematical thinking, as an important problem-solving strategies, in the study of mathematics and mathematical study has important value. It reflects the split-up, the plot is for the whole thinking. First, it introduces the idea classification should follow the principle of Classification Act discuss conventional methods and classification methods discussed the general steps Classification of thinking can understand better the application of it. Then, the paper highlights the collective thinking of the classification, with parameters and permutations of the problem. Finally, we apply the dialectical thinking, from both positive and negative thinking on the classification of some special topics in the Classification Using ideas and limitations.