JI Xian-lan,the great scholar in Qing Dynasty,had been in Chengde for many times to collate and revise "Imperial Collection of Four" for he was assigned as chief editor In his spare time in the Summer Resort,he wrote "Summer-spending in Luanyan" and its sequel.

Research on Ecological Control over the Luanhe River in Chengde County of Hebei Province;

AFS method is used to analyze micro amounts of arsenic and selenium in the Luanhe river,this method is simple,rapid and high sensitivity.

Preliminary study on comprehensive harness of Qian an Section of Luan River;

Model Design and Experimental Study on Water and Sedimentation of Meandering River for Qianxi City Section of Luan River;

Health Risk Assessment on Heavy Metal Pollution in the Water Environment of Luan River

Relationship between pollen assemblages and vegetation in alluvial sediments of Luanhe River Basin;

Research on Flood Control by Combined Operation of Reservoirs on Luanhe River Middle and Down Stream;

Rare earth elements of the zircons from the mesozoic volcanic rocks in Luanping area, Hebei, were analyzed: The results show that the average values of δ_ Eu and (Lu/Gd)_N are 0.

The Mesozoic strata in Luanping, North Hebei Province are the most complete in North Hebei-West Liaoning, and the Luanping area is the only area where the deposit action in the Late Mesozoic is successive.