Abstract: The granitic soil samples were collected from the saprolite soil slopes of Tianzhushan area and their grain size distributions were laboratory tested. The results indicate that the ununiform coefficients were obviously high. The samples were wellgraded and the sizes in the granular soil samples varied significantly. Under heavy precipitation condition, the saprolite soil slopes were easily damaged by the erosion. It is therefore, the slope protection becomes very important and the biological slope stability remediation measures are also proposed.

Key words: Saprolite Soil Slopes, Weathered Granite, Grain Size Distribution Analysis, Biological Slope Remediation