The changes of loess hilly area erosion intensity in space and time are a comprehensive reflection of changes in natural factors and human factors. The natural factors mainly include ones that affect erosion such as terrestrial surface substance composition, vegetation covering rates, topography , landforms, precipitatio ns, and soon. Human factors mainly refer to human activities affecting erosion acceleration and soil conserv ation control degrees. On the basis of remote sensing investigation on soil erosion, the regularity in relation with the above factors affecting area distinctions of erosion intensity are analyzed.