Advances in Study of Ecological Degeneration and Restoration of Northern Region of Loess Plateau

North region of Loess Plateau is one of the most serious regions of ecological imbalance in China.A series of ecological questions in the area not only threaten local people's livelihood and development,but also affect the environmental quality and economic development of the east region in China.Therefore,it has become very important to take the theory and practice of ecological restoration in this region.The authors analyzed and summarized the advantages and disadvantages of theory and practice of ecological decline and restoration about this region in several decade years.Some suggestions about how to well carry out ecological restoration of this region were also put forward.It will become assistance for further developing the theory and practice of ecological restoration in this region in the future.