Whitebacked planthopper (WBPH) is a kind of long-distance migratory pest. Its occurring amount is closely related to the climate change of large sphere. In recent years many researches have reported that the climate of large sphere was affected by the Pacific sea temperature (ST). We studied the long-range forecast of the occurring amount of WBPH by using data provided by State Meteorological Administration, China. Taking the highest amount per 100 hills in main injurious generation of WBPH on early rice in Ganzhou Prefecture, Jiangxi Province as the object of forecast (y), and dividing y into six grades,i.e. 1-6 grades means the sequence of 1,000,1,001-3,000, 3,001-5,000, 5,001-10,000,10,001-20,000, and over 20,000 heads in order. Three regions were selected from the 286 grid points in the northwest Pacific. Region A was the maritime space between Black Tide Region and California Cold Flow Region, 160°E-130°W, Its occurring amount is closely related to the climate change of large sphere. In recent years many many researches have reported that the climate of large sphere was affected by the Pacific sea temperature (WBPH) is a kind of long-distance migratory pest. ST). We studied the long-range forecast of the occurring amount of WBPH by using data provided by State Meteorological Administration, China. Taking the highest amount per 100 hills in main injurious generation of WBPH on early rice in Ganzhou Prefecture, Jiangxi Province as the object of forecast (y), and dividing y into six grades, ie 1-6 grades means the sequence of 1,000,1,001-3,000, 3,001-5,000, 5,001-10,000,10,001-20,000, and over 20,000 heads in order. Three regions were selected from the 286 grid points in the northwest Pacific. Region A was the maritime space between Black Tide Region and California Cold Flow Region, 160 ° E-130 ° W,