Using the Landsat TM data in the years of 1997 and 2002

the land cover map has been made respec- tively in sample areas locating in Zhangjiakou

Yulin and Dngxi

and then analyzed the effect of National Key Project of Ecological Environment Construction and the changed characteristics of land cover landscape according to the transformed acreage of land cover types and landscape indices. The results showed that a serious of con- struction measures in practicing

such as

returning farmland to forestland or grassland

have an effect on the amelioration of ecological environment. As the difference of climatic and economic conditions in different sample areas

it is easier to carry out the Project and to achieve more successful result in Zhangjiakou sample area than in Yulin and Dngxi's. The land cover change of all sample areas characterized by farmland decreasing

natural or semi-natural vegetation increasing

and the reducing of irregularity of patch shape of them. On the landscape scale

the complexity of patch shape and the variety of landscape all has decreased.