Abstract: Based on digital elevation model (DEM) in Songnen Plain, 2 databases were built up with GIS technology. Geographical database depended on longitude, latitude and altitude, and topographical database depended on slope, aspect and sheltered degree. Then, the mathematic relationship between main climatic factors month-by-month and macro-geographical information was developed in Songnen Plain with the model of two trends-surface of three-dimension, using observed data including solar radiation, air temperature, rainfall and relative humidity, during 1961-2000 from all of the meteorological stations in this region. At last, the synthetic mathematic model of spatial distribution of climatic factors in Songnen Plain was completed, and the digital map with grid information 1km×1km on climatic factors in Songnen Plain was carried out with GIS technology.

Key words: Spatial distribution model, Spatial distribution model, GIS, Climatic factors, Songnen Plain