Abstract: From 2006 to 2011 in Lijiang City,the 76 strong convection rainstorm and hail process,from the effects of weather system,the water vapor condition,atmospheric stratification structure,energy conditions and mesoscale moisture,jet characteristics in 5 aspects to carry on the analysis,obtained the following conclusions:one is the middle troposphere,northerly flow low level shear vortex,surface cold air is the strong convection rainstorm and hail formation of the main weather systems in summer and autumn,West Pacific subtropical high extended West or East annealing process,at its edges may also occur in the strong convection rainstorm and hail;two is the majority of the strong convection rainstorm and hail formation,gas reservoir without obvious stable characteristic,08 when the convective instability of the indicating no significant effect;the three is the strong convection rainstorm formation,low layer deep high moisture layer,and has good water vapor transmission,and hail formation,dry wet stratification characteristics;four is the tropospheric jet streams in Lijiang strong convective heavy rain or hail formation is indicative of poor; Five is to attach importance to higher levels of vertical shear of wind analysis.