Collapsing hill erosion profile of granite weathering crust was analyzed by combining the grain size method and chemical weathering index method. The results showed that: (1) the silt gravel component was the highest, whose the average value is 52.52%, the sand gravel component was 38.38%,the lowest clay gravel component was 9.09%. The silt gravel component (4~63 µm) was correlation with fine clay gravel component (63 µm) had a significant negative correlation with fine clay gravel component (
