During thd movement of various freezed gobbets in glacier,the Gravel and gobbet exist scratches in the polished surface of rocks are called glacial steaky rocks.In the glacial U-shaped valley of Wangjiapo,there is approximate pentagon huge hard silicarenite drift with diameter up to 5m,in the surface of the huge drift the glacial scratches with about 5 to 19cm long,0.7to 1.5cm with and 0.5 to 3cm deep can be seen.The surface of the glacial drift with deep narrow and smooth scratches is polished smoothly .The direction of scratches is almost same with that of U-shape valley,this is the of the main proofs of glacial.