Abstract: A rainstorm process ahead of cold front in eastern Fujian,simultaneously influenced by upper trough,low level shear,and surface cold air,was analyzed based on the MICAPS data from April,30th to May,1st,2013,reanalyzed data of NCEP 1°×1°,and data of Fujian Regional Automatic Station.With analysis on physical quantity structure,it found that the jet ahead of trough in southwest supplied sufficient water vapor for the rainstorm,the passed cold front made the air conditions unstable,and the strong divergence field and front pressed towards south formed uplift condition.Effects of the strong rainfall on production and quality of Tie Guanyin tea leaves were also analyzed.