The relationship between sea surface temperature of the Pacific and spring continuous rain in Jiangsu Province is studied using methods of linear and nonlinear optimal transformation. The analytical results shows that the correlation coefficient was notable between them. The variation of sea temperature in every sea area in the second half year corresponds closely to the spring continuous rain of JiangSu next year from the size of correlation area

and the character of SuNan and JiangHuai is better than that of HuaiBei. The correlated area of HuaiBei continuous rain is in high latitude in winter and spring

and in low latitude in summer from the position of sea area. The correlated sea area of other districts changes from high latitude to low latitude starting from the spring. Then

the influence of ENSO on the frequency of spring continuous rain of the same year and next year in JiangSu was analysed using the T-test

and it is found that the frequency of spring continuous rain of the same year and next year in JiangSu are positive correlation with El Nino. As for La Nina

the frequency of spring continuous rain of next year in JiangSu is negative correlation

and no influence of the same year.