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Base on the compound analysis of radiosonde data from 1980 to 1999,the ambient fields of hail events in springtime in Fujian Province were summarized.The main weather patterns which engender hails in Fujian are: moderate cold shear,moderate vortex and cold shear,westward deflection vortex and cold shear,southward deflection cold shear,and westward deflection cold shear.The main influencing weather systems are: upper-level westerly trough,southern branch trough,subtropical jet,strong low-level southwest jet and quasi-stationary shear line.An analysis was made of the thermal and dynamic conditions and water vapor conditions during the hail events.It is found that Fujian Province was in the area of high-energy,strong potential instability,and high water vapor flux during the hail events.It was in favor of the convection development over Fujian Province that there was convergence at the low level and divergence at the upper-level.