Storm relative helicity(SRH) reflects eddies in environment wind field and surrounding vorticities inputted into convective cell in an air layer, which is useful to analyze and forecast thunderstorm, tornado, large-area heavy rainfall as well. A method and steps of calculating SRH are presented, first, with Doppler radar vertical wind profile (VWP) product. Then, the SRH of three cases of heavy rain, hail, gale are discussed. Results indicate that the SRH is well corresponding to the intensities of the heavy rain in large area, the change of intensities lags the SRH change about 30 minutes, the time of precipitation strengthening or disappearing, therefore, can be approximately estimated by it. In addition, the SRH has effectivity about 10 to 20 minutes ahead to forecast micro-scale hail and gale, and then the SRH calculated with VWP can be used as a forecast index for strong convective weather such as a heavy rain, hail, gale, etc.