Based on daily summer rainfall data 1955—2000 at 91 stations in Northeast China and corresponding NCEP/NCAR water-vapor transportations, the regional characteristic of summer rainfall in Northeast China is analyzed, and further research of the features of abnormal water-vapor transportation of the flood years is carried out. The results show that the summer rainfall anomaly of Northeast China has obvious regional characters, there are six independent areas there. The study of the differences of water-vapor transportation between the flood years and the normal years indicates that the paths and key regions of the anomaly water-vapor transportation of one area are different completely to the other's.