Debris flow waste-shoals (WFWS), also called debris flow fans or debris flow accumulation fans, are mainly distributed in the valley of mountian area where there are concentrated population, intensive development and construction, and tense land resource. Because of the abunant resources of water and solar energy, gently topography, and convenient transportation, WFWS has now become the significant area where can be used to develop the rural tourism, construct the mountain town and be the farm land. Meanwhile. WFWS as the special land resource, we have to protect it for the sustainable development of rural economy and ecological environment protection. In the face of the increasing population-resource-environment-urban and rural development integration issues, The study of safety and high efficiency development technology and mode of debris flow accumulation fans has become an important moves of regional eco-economic environment sustainable development and ecological security guarantee.

So, regarding the debris flow waste-shoal as the special land resource, I want to do something to explore the debris flow waste-shoal, and finally, the concept of debris flow environmental capacity is put forward. This concept aims to describe the total capacity of debris flow fans. But, as you know, there are many problems: what are the indicators? How to calculate the debris flow waste-shoal environmental capacity? And so on. I hope you can give me some suggestions just from your opinion and your professional knowledge on land use and land cover change. Very thanks.