The objective of this study was to examine the effects of microenvironmental heterogeneity on the spatial distribution of herbaceous species in a temperate hardwood forest in Mt, Jumbong which lies within the core area of Mt, Sorak Biosphere Reserve, Korea. Most of all herbaceous species showed the variations among micropoints in a permanant plot. Corydalis turtschaninovii, Disporum smilacinum and Viola rossii in early spring and Meehania urticifolia, Melica onoei and Adenophora grandiflora in autumn showed a high degree of spatial dependence. Anemone koraiensis and Erythronium japonicum in early spring were spatialy dependent at a scale of 50∼54 m. Adenophora grandiflora and Melica onoei in autumn were spatialy dependent at a scale of 8∼20 m. The other herbaceous species were spatialy dependent at a scale of 〉 62m. Coverage of Viola rossii, Disporum smilacinum and Erythronium japonicum were negatively correlated and coverage of Symplocarpus nipponnicus and Corydalis turtschaninovii in early spring were positively correlated with coverage of shrub species, litter depth, soil moisture content, organic matter and soil nutrient contents. Coverage of Isodon excisus in autumn was positively correlated with relative light intensity, litter depth, soil moisture content and soil nutrient contents. Coverage of Ainsliarea acerifolia, Carex siderosticta, Pseudostellaria heterophylla, Aster scaber, Melica onoei and Adenophora grandiflora in autumn were negatively correlated with litter depth, soil moisture content and soil nutrient contents. Leaf litter of forest floor in this hardwood forest was spatialy redistributed by wind direction, shoot density of shrub species and microtopography. Soil moisture content, organic matter content and soil nutrient contents on microhabitat were affected by spatial pattern of leaf litter. In conclusion, we estimate that spatial distribution of herbaceous species in this hardwood forest was largely affected by microenvironmental heterogeneity caused by redistribution of leaf litter.