Based on the precipitation data in April and May for the period 1958-2012 from 178 meteorological stations in Northeast China, JRA55 and NCEP/NCARI reanalysis, the study is performed of the first soaking rain date as well as its relation with the soaking rainfall and the total rainfall from April to May. In addition, response of the soaking rain date to the surface heat source over the Tibetan Plateau is also discussed. The results suggest that, since 1958, the soaking rain date in Northeast China, has shown a positive relation with the soaking rainfall and a negative relation with the total rainfall, suggestive of the place where the soaking rain date is early (late), the soaking rainfall is smaller (larger) and the total rainfall is larger (smaller). Besides, the correlation between the surface heat source over the Tibetan Plateau in April and the soaking rain date is negative, which means when the surface heat source in April gets enhanced, cold air from the north and warm air from the south intersect over Northeast China, updrafts, are strengthened, and water vapor transport is abundant, making the soaking rain date in Northeast China come early (late).