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The method for simulating the temporal and spatial distribution patterns of leaf area index(LAI) and biomass at landscape scale using remote sensing images and surface data was discussed inthis paper. The procedure was: (1) annual maximum normalized difference vegetation index (NDVI)over the landscape was calculated from TM images; (2) the relationship model between NDVI andLAI was built and annual maximum LAI over the landscape was simulated; (3) the relationshipmodels between LAI and biomass were built and annual branch, stem, root and maximum leafbiomass over the landscape were simulated; (4) spatial distribution patterns of leaf biomass and LAIin different periods all the year round were obtained. The simulation was based on spatial analysismodule GRID in ArcInfo software. The method is also a kind of scaling method from patch scale tolandscape scale. A case study of Changbai Mountain Nature Reserve was dissertated. Analysis andprimary validation were carried out to the simulated LAI and biomass for the major vegetation typesin the Changbai Mountain in 1995.