According to the biological characteristics of eel (Anguilla japonica)and the phenomenon of El Nino, a study on the relation between eel fry catchesand the environment has been attempted, By using statistic method to analysethe data of recent three years, it was found that the fluctuation of the eel fry pro-duction correlated with the SST anomalies of eastern Pacific. And also, the increm-ent or reduction of eel fry catch can be affected by El Nino. The year next to ElNino year is the year of increment of eel fry catch. The period of increment or re-duction of eel fry catch is 2-4 years. As to the catch level before 1987, the propor-tion of eel fry catch among the world, mainland of China and Japan is 100: 35: 45.Under the most situation, when 8.7≥AT≥-0.7, the eel fry catch will increase.Otherwise, it will reduce. The forecast regression equation of the world's eel frycatch can be described as follows:ΔC_n=31AT_n-1+22tons(AT≤4.0)ΔC_n=-31T_n-1-270tons(AT4.0)