Abstract: Vegetation restoration and rehabilitation is one of the effective meas ures in controlling soil erosion. To study the process of vegetation restoration and rehabilitation and to assess vegetation community health are of great pract ical significance in speeding up vegetation construction. Based on the character istics of loess hilly and gully region, a relevant index system for vegetation c ommunity health assessment was built to assess the health status of the steppe c ommunity at different stages of vegetation restoration and rehabilitation. Durin g the process of vegetation restoration and rehabilitation, the vigor of steppe community changed in parabolic, the organizing force of the community was basica lly in fluctuation, and the restoring force changed in opposite way to the vigor . When the vigor index reached to the maximum, the restoring index dropped to th e minimum. Soil health presented a fluctuated improving trend. The comprehensive assessment indicated that with the succession of vegetation, the steppe communi ty health in loess hilly and gully region had a fluctuated ascending trend.

Key words: Genotype, Environment, Wheat, Quality