By using three-period(1986,2000,2009) remote sensing images,with the support of RS and GIS,spatial information of grassland landscape in Taipusi from 1986 to 2009 is extracted,spatio-temporal dynamics of grassland and change of grassland landscape patterns are analyzed.The results showed that from 1986 to 2000,the areas of grassland decreased about 307.67 km2 and degraded seriously.Many grasslands are converted into cropland.The ecological environment has became deterioration.From 2000 to 2009,grassland are...