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Based on the previous research on the model of rainstorm weather with low-level jet in Xiangtan, using the classification result of radar echo characteristics, the wind profile data provided by new generation of weather radar in Changsha and hourly rainfall data, a thorough study of the heavy rainfall from 2 to 5 July 2016 in Xiangtan was conducted. It was concluded that heavy precipitation had the characteristics of the WPSH pattern of rainstorm with low-level jet at early stage, and then it converted to cold shear jet pattern in latter stage. When low-level southwest jet began to have momentum download, that is to say, there was more than 12 m/s of southwest jet below 1 km, and it rapidly strengthened and expanded downward, it was conducive to the occurrence of short-term rainstorm. The low-level jet would not immediately cause a strong precipitation when it reached the station, with a certain lag. A positive correlation existed between the increase of low-level jet index and precipitation intensity, and low-level jet index could predict the occurrence of heavy rainfall and rain intensity. [ABSTRACT FROM AUTHOR]