| Loess Plateau is the birthplace of 5000 years' civilization of Chinese nationality, which occupies 623.8 thousand square kilometers, 6.54% of the country's area, and used to be full of forestry and picturesque scenery. However, with the people's increasing disturbing and active strength on the vegetation, the region's water and soil erosion, wind and sand harm are more and more serious. Loess Plateau has become one of the worst serious water and soil erosion regions of the world, and is also one of the most frangible eco-environmental regions of China. The hilly and gully area of Loess Plateau, which distributes in the middle of Yellow River and the north of Loess Plateau, is the main resource of water and soil erosion from Loess Plateau. It occupies 227.4 thousand square kilometers, and involves border-on region of Jin-Shan-Meng, region of west of Jin and north of Shan, region of east of Long and north of Shan, and region of middle of Long and south of Ning. The hilly and gully area of Loess Plateau in Inner Mongolia is a part of hilly and gully area of Loess Plateau, which locates in south of Yinshan range, the part of Inner Mongolia prolonged by Loess Plateau, east of Ordos Plateau. It locates in the border-on region of Jin-Shan-Meng which involves two branches of Huangfuchuan basin which are Nalinchuan river and Changchuan river, most of Hunhe river and the upriver of Qingshuichuan river and Boniuchuan river.Assessment method of natural index system was used in this paper, the theories of analytic hierarchy process and fuzzy mathematics were applied, and combined with the theory of net-hierarchy. Three sample areas of original vegetation (Aguimiao natural conservation), degenerated vegetation (Yangquangou) and reconstructed vegetation (Wufendigou) of the hilly and gully area of Loess Plateau in Inner Mongolia were chosen to be studied from the aspects of ecosystem health vigor, organization structure, system service function and soil health. Through the study on the health situation of natural ecosystem compared with the original island vegetation, Aguimiao Natural Conservation, 7 kilometers distance from the south-west of Huangfuchuan basin, the ecosystem health assessing index system and the weight system which adapted to this region were put forward, and the ecosystem health index assessing model and the index level standards wereestablished. The restoration routes of the ecosystem health were also discussed in the end. The results showed that:(1) From the theory and method, combined with the facts of hilly and gully area of Loess Plateau in Inner Mongolia, especially the three selected sample areas, the assessment index system, weight system, assessment model and index level standards put forward by this paper were practical .and realistic, and they were also reasonable and scientific. The reasons were: (1) On the foundation of the works of prehuman, consulted the related research results in and out of country, combined with the theories of Ecology, Conserve-biology, Soil-and-water Conserve and Agrology, the intact assessment index system of ecosystem health was put forward from the point of view of natural ecology; (2)On the foundation of extensive consultation to lots of specialists, combined with the theory of net-hierarchy, through endowing with weight value on each indicator of each level and returning one layer by layer, the reasonable weight system was put forward; (3)Through applying the advanced theory of analytic hierarchy process, combined with the theory of fuzzy mathematics, non-dimension dealing with the assessment index, and conforming layer by layer, avoiding the simple assessment methods of "arithmetic average" and "geometry average", the scientific assessment model of ecosystem health and the assessment index level standards were established. In a word, from the view of natural ecology, the index system and assessment model established by this paper could be fully applied in the assessment of ecosystem health of this region on the scale of system.(2) On the ecosystem vigor, the h...
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