Abstract: Based on TM,MSS and relief map,with expert knowledge,the information of land use/cover change in 1954,1976,1986 and 2000 were obtained in Sanjiang plain; At the same time, using GIS and USLE, according to the actual situation in Sangjing plain, by choosing the reasonable methods to calculate R,K, LS, C,P factors in the USLE, the soil erosion of Sanjiang plain in 1954,1976,1986 and 2000 was evaluated. Then with consideration of the geomorphologic unit and the soil erosion intensity grading map of 2000,Sanjiang plain was divided into 7 different regions.They were northern hejiang plain region,southeast muling-xingkai plain region,southwest woken river-valley plain region,west qingheishan low mountain and hill region,east wandashan low mountain and hill region,southwest aerhawoshan low mountain and hill region,and south laoyeling-kenate-taipingling low mountain and hill region.For the different regions,their LUCC pattern and soil erosion state were quantitatively analyzed and evaluated during the past 50 years.By these analysis,the trend and actuality of LUCC and soil erosion were acquired.Then we can provide some scientific suggestion for the land use and erosion control.So we expect these reasonable suggestion can help the management and decision-makers for the sustainable development in this region.

Key words: Sanjiang plain, land use/cover change, soil erosion, 50 years