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The advancements in the researches on LLJ (Low Level Jet) in China in recent 40 years are reviewed with emphases on the structure characteristics and possible mechanisms of LLJ and the relationship between LLJ and severe convective weather, which include the classification of LLJ in two different ways, the spatial distribution, and the formation causes. However, the observation time for collecting radiosonde data and the occurrence time for LLJ do not match. Moreover, the special observation of LLJ has not been widely applied because of its high cost. Therefore, due to the difficulty of LLJ observation and the lack of specialized researches in China, the further study will be needed, especially in the structure characteristics of LLJ itself.