This paper discusses a approach of computing the E_CAP in detail,by adopting theMM5V3.5） output data,introducing an atmospheric thermodynamic variable,density temperature T_ρ,and according to the reversible saturated moist adiabatic process in the environmental atmosphere.Based on this,the energy-helicity parameter I_EH is introduced.Besides,through analyzing the value variations of the E_CAP and I_EH parameters in the "03.7 "Jianghuai Meiyu period severe convective process,it is found that E_CAP and I_EH parameters are usefull in the prediction of the severe storm’s occurrence and development,and worth noting in operational predictions.