The Emeishan basalt landslide with the landslide in Touzhai of Yunnan, China as a representative is wide- ly developed into a large long-distance and high-speed landslide-debris flow which is dangerous, while grain-size composition of deposit body for such kind of landslide is still lack of systematic study. This paper takes the Touzhai landslide of Zhaotong, Yunnan province, China as study object, combining with the laboratory experiment, through the field sieving experiment, investigation of the grain size of leaching block stones and huge stone and clay sam- piing analysis, the grain-size composition of deposit body is understood omnibearingly ranging from large to small. The results show that there are little difference in the distribution of grain size of the landslide deposits which mainly range from -6 d~ to -3 d~ from above downward. Based on the hugestones ratio less than 1%, the hugestones can be inferred to be the bottom bedrock of instability rock in slippery source area. The clay counts for the least though, it has important control significance in the degradation to rock quality.
