Abstract: Based on maize yield data, NCEP re-analysis data, self-calibrating Palmer drought severity index (scPDSI), standardized precipitation-evapotranspiration index (SPEI), soil water content and sea surface temperature (SST) data, the effect of pacific SST tripole on climatic yield of spring maize in northeast China was analyzed.It was found that the climatic yield of spring maize in northeast China was significantly correlated with the Pacific SST tripole from January to May of the harvest year.The Pacific SST tripole could influence the regional circulation field during the seeding stage and the whole growing season of spring maize in northeast China through the teleconnection pattern over the Pacific, and then affect regional precipitation, soil moisture content, scPDSI, and SPEI, which are closely related to the climatic yield of spring maize in northeast China.When the Pacific SST tripole strengthens, a Rossby-wave-like teleconnection pattern will be formed over the Pacific, resulting in a negative vorticity anomaly in the upper air of northeast China, which is conducive to the formation of local updraft and the increase of precipitation.The Pacific SST tripole is also conducive to the formation of the southeast wind anomaly from the northwest Pacific to northeast China at the low level, which further enhances the precipitation in northeast China through water vapor transport.