Abstract: Based on the TM images in 1997 and 2007, and by using GIS spatial analysis, this paper analyzed the impacts of water conservancy project on Yalu River delta in last ten years. In the meantime, with statistical methods and by using Markov Model, the evolvement of Yalu River delta in the next 20 years was predicted. The results showed that water conservancy project reduced the sediments transported to the River, and the delta eroded intensely. Due to extensive reclamation, the west channel of Yalu River was silted up severely. In the future, Yalu River delta would be eroded more seriously, and, when the erosion arrived at stable state, the waters area in the delta would take up 44。9% of the total, and the landscape matrix would be changed.

Key words: Shelterbelts/windbreaks, Shelterbelt porosity, Digitized measure, Improved method