Abstract: By using the routine meteorological data,NECP 1°×1° reanalysis data,we carries on the key analysis of the physical quantity of two coninues rainstorm weather process on the edge of subtropical high on July 1st to 4th,2012 in Dazhou.The results show that the storm have a good corresponding relationship with the K index and the change of potential pseudo-equivalent temperature vertical gradient,850hPa specific humidity can well reflect the lower atmospheric water vapor content,which can be an important reference index for the heavy rain.The edge of subtropical High southerly airflow provides good vapor conditions.The vertical helicity and rainstorm center has good corresponding relationship.The edge of subtropical high.The southwest airflow of the edge of subtropical high increase the vertical vorticity,and strengthen the system baroclinity,which is good to produce the rainstorm.