Heidashan area in Eji'naqi of Inner Mongolia is located in Sb mineralization perspective area of Beishan,and its ore-forming geological conditions are very favorable.

In this paper we use tree rings of Populus euphratica to reconstruct past climate and hydrology variations in Ejin which is located in the northwest part of Inner Mongolia.

Study on the ecological water requirements for restoring the oasis in Ejina Region;

Since 2000,the State has conducted integrated water regulation of the main Heihe River in the light of continuous area reduction of trees and grasses vegetation and gradually deterioration of the ecologic environment of Ejina region on the lower Heihe River.

Studies on protection measures of natural forest and grass in Ejina Area in lower reaches of the Hei River;

Discussion on Optimal Water Resources Utilization Mode Selection in Ejina Area;

The water system of lower Heihe River in Ejin region has experienced the migrating processes from east to west in the past 2000 years.

In surveying to the agriculture and stockbreeding alternation, and oasis environment evolutional process of the Ejin region in historical period, an integrated research on river system change, oasis evolution, desertification process and the shift of human activity center has been conducted.