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As the engine emission of particulate matter(PM) pollution is taking attention by the people, the testing method about emission also need to be solved. In this paper, it starts from the principle of PM measurement, and introduce in detail the classification of various testing methods, in addition, this paper introduces the typical particulate matter testing equipment which has entered the stage of practical on the basis of principle, and analysis the measurement methods of these types of devices and their limitations. At the same time, emphasis the importance of the analysis of size distribution on particulate emission tests.