Abstract: West Ordos Nature Conservancy Distribute locates at north environment fragility belt of Hungriness and Half hungriness Belt in China. The plants in this area have always appeared the sign of Hungriness specific vegetation from tertiary evolvement till now. It is overwhelming importance of academic value and diagnose meaning to study environment evolvement, biology diversity and globe transformation, with great worldwide attention of researcher of many subjects such as biology, ecology and geography. Traditional research method and sample statistic approach is not only need more time and labor, but also are difficult to totally comprehend and monitor the biology diversity and environment. Take advantage of two scapes of TM and ETM data from Landsat 5,7 planet at an interval of 12 years(Sept.1987 and Aug.,1999 )、1∶250,000 scale DEM data and sample statistics data, Researchers can use remote sensing technique to study the distribution pattern and changes detection of West Ordos Vegetation, which acquires rapid and precise large scope and real time data of resource environment status and its changes, produces a virtual reality 3 D imagery ,and merges with the synthesis analysis of Sample statistic. It opens up vegetation diversity rule and changes status at 12 years intervals. It takes reasonable advantage of these vegetation resource, and provides basis to the revival of damaged hungriness ecological system. At the same time, it is important to protect and improve hungriness environment and to explore the persistent development of hungriness distribution.

Key words: 3-D imagery, Detect change, Vegetation index(NDVI), West Ordos