Along the south and north feet, as well as in individual valleys of the Ayila Rigyu Mountains, Ali area, Xizang (Tibet) there are four sets of early Pleistocene glacial deposits. Based on the stratigraphic sequence of the glacial deposits and the glacial ages determined with the electron spin resonance, the four glacial events in the early Pleistocene are named the Zomda glacial epoch (1161- 952 ka BP), the Ayila Rigyu glacial epoch (762-730 ka BP) , the Xuelang glacial epoch (336 - 211 ka BP) and the Nongqiong glacial epoch (105 - 15 ka BP). Comparisons were done between these glacial epochs and other glacial epochs in the Qinghai - Xizang Plateau and some other areas. The glacial epochs are characterized by great mountain glaciers, ice caps, piedmont glaciers and medium- to small-scale valley glaciers. The existing glaciers had glacial advance in the Holocene and the glaciers have clear recession in the present period.