By analyzing the intrinsic causes and external driving force of ecological degradation,the prerequisite of ecological degradation in the upper and middle of Dang River should be the arid climate and the fragile ecological environment,and the largest interference comes from human economic activities.

Primary Study on the Environmental Instability During Holocene in the Upper and MiddleReaches of Weihe River;

Using the energy balancing method to set up the energy and water balance monitoring System(EWBMS) for the real time monitoring in the upper and middle Yellow River Basin,and comparing the calculated values such as actual evapotranspiration,temperature,net radiation,sensible heat flux with the observed data,and hereby to improve the accuracy and reliability of the EWBMS output.

The Study on City Location of An-ding Prefecture and Its Belonging County at Jing River upper and Middle Reaches in Han Dynasty;

Relationship between ecological distribution of grasshoppers and their habitats in the middle and upper reaches of Heihe River