1 Advance of freshet analysis is one of key measures of preventing or controlling flood, which have been widely applied on urban flood proofing, basin planning and engineering construction.

2 Freshet and power failure have an impact on construction for 2 hours.

3 Critical precipitation inducing freshet was analyzed and confirmed in this article through the relevant data of mountain torrent disaster and precipitation.

4 The basin information, the information and characteristic of the historical freshet disasters and the present situation of the rainfall information monitoring of Jian city were introduced.

5 This paper analyzed the reasons and the characteristics of the freshet disaster of Southern Jiangxi and put forword the main measures of the freshet disaster control.