The invention relates to a meteorological data distribution map display method and system for a geographic information system GIS. The meteorological data distribution map display method comprises thesteps: drawing a geographic meteorological distribution map based on an NCL language, and setting the latitude and longitude boundary range of the projection of the geographic meteorological distribution map; adjusting the latitude and longitude range to be consistent with the meteorological distribution map, and superposing the meteorological distribution map on the geographic information systemGIS map; and displaying the meteorological distribution map by the geographic information system continuously and dynamically according to the predefined grid numbers and the drawing time of the meteorological distribution map. According to the scheme, a direct data rendering method of the GIS can be replaced, and the meteorological data display speed of the GIS is greatly increased under the condition that the display quality is ensured.