Abstract: Based on hourly precipitation data from 80 national stations in Heilongjiang Province and reanalysis data jointly produced by the National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR), we analyzed the climatic characteristics of the Northeast cold vortex (NECV) and its precipitation during the warm season from May to September between 1981 and 2022. The study focused on the spatiotemporal distribution of NECV precipitation in the complex terrain of Heilongjiang Province. The key findings include: (1) In Heilongjiang Province, the average annual precipitation during the warm season and the precipitation of NECV processes and their proportion in the warm season demonstrated significant interannual and interdecadal variations. Before 1998, warm-season precipitation gradually decreased, followed by an obvious increase, while NECV precipitation showed an overall upward trend. (2) Precipitation and its frequency peaked from 1400 BJT to 1700 BJT. The daily variation in precipitation was more pronounced than that of its frequency, especially for higher intensity precipitation, which exhibited significant daily and yearly variations. (3) Heavy precipitation occurred more frequently during the daytime than at night. The greater the precipitation intensity, the greater the influence on total precipitation. The contribution of heavy precipitation in NECV processes has been increasing, with stronger precipitation showing a more pronounced upward trend, while the contribution of weak precipitation has been declining. (4) The spatial distribution of extreme values was strongly affected by local topography. The area transitioning from plain to mountainous areas recorded the highest extreme precipitation values, indicating a higher likelihood of heavy precipitation, while extreme values were lower in purely mountainous or plain areas.