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The framework of traditional certification market is based on the theory of one sided markets and ignored the two sided markets feature of certification market. The paper takes ISO9000 certification market as an example to illustrate characteristics of ISO9000 certification market through four aspects: demand complementarities, users heterogeneous, crossover network externalities and tilting pricing .Also the paper studies the key problems of the development of the market.

Operation Mechanism of Certification Market Based on the Theory of Two Sided Markets: Take ISO9000 Certification Market as an Example