Charactors of the storms and floods happened in Qingjiang River Basin and meteorological homogeneous region where Qingjiang River flows have been analysed in this paper. Based on above charactors,it is conjected that the synoptic situation of the storms in Qingjiang Valley is similar to plum rains synoptic situation in the valley. In the period,the flood-producing storms in Qingjiang Valley often appear.The moisture forming heavey rainfall in Qingjiang Valley comes from the south-west.In this paper,the probable maximum storms for 24h and 3d in Qingjiang Valley are estimated using enveloping time-areadepth curves approach.