Abstract: Based on the hourly precipitation data of 80 national stations in Heilongjiang Province and NCEP/ NCAR reanalysis data, the climatic characteristics of the Northeast cold vortex (NECV) and its precipitation during the warm season (May-September) from 1981 to 2022 were analyzed, and the spatio-temporal distribution characteristics of NECV precipitation in the complex terrain of Heilongjiang Province were studied. The results showed that (1)In Heilongjiang province, the average annual precipitation during the warm season, the precipitation of NECV processes and their proportion in the warm season showed significant interannual and interdecadal variation characteristics. Before 1998, the average annual precipitation in the warm season showed a slow weakening trend, and then an obvious increasing trend. The average annual precipitation of cold vortex processes showed an overall increasing trend. (2)The peak values of precipitation and precipitation frequency were from 14:00 to 17:00. The diurnal variation of precipitation was larger than that of precipitation frequency. The precipitation with greater intensity had more significant diurnal and interannual variation characteristics. (3)The frequency and contribution rate of heavy precipitation were greater in the daytime than at night. The greater the precipitation intensity, the greater the influence on the total precipitation. The contribution of heavy precipitation in the process of NECV was increasing, and the greater the precipitation intensity, the more significant the increasing trend. The contribution of weak precipitation was declining. (4)The spatial distribution of extreme values was closely related to the local topography. The transition area from plain to mountainous area had the largest precipitation extreme value, which was easy to have heavy precipitation, while the precipitation extreme value in mountainous area and plain area was relatively small.