Abstract: Moluocun landslide distributes many ancient blockhouses,which are the key cultural relics preservation object of the Sichun Province.However,the rising of water level in Houziyan reservoir may reduce the stability of the landslide and even damage the blockhouses located on the slope.So the problem of slope stability is one of the most sensitive questions.In this paper,authors analyze the structures and failure mechanisms of the blockhouses,assess current status of slope stability and its change after inundation.At a normal pool water level(NPL) of 1852m,the slope is stable as whole after inundation of Houziyan reservoir.However,some slumps and rock falls may occur near the edge of the rising water and at the toe of the slope.With appropriate protection of the slope toe and prevention of slumps and rock falls,impacts of inundation of the reservoir can be minimized and the blockhouses can be protected.