The comparative diagnoses of thermodynamic parameters and dynamics show that obvious difference of dynamic and thermodynamic mechanics exists in the two severe convective storms developed in and to the northwest of subtropic high along the Changjiang River in East Anhui in the summer of 1996.It is found by conducting the Q vector analysis that the severe storms and heavy rain areas are in accordance with the convergence of Q vertor.The focus attention of short range (0-12 hours) prediction of the two kinds of severe storms is given.