Benefit evaluation of soil and water conservation project is of great significance to the macro policies-making.Based on the past studies on index system and method of comprehensive effects assessment of water- soil loss control and present local natural,social and economic condition as well as controlling status,the ecological benefits,economic benefits and social benefits of Ganzhou area during the past thirty years are evaluated.The value of ecosystem service of soil and water conservation is 0.630 billion in 1980,2.598 billion in 1997 and 4.165 billion in 2007,respectively.The cumulative benefit of eight national soil and water conservation projects in 1997,2002 and 2007 is 1.711,3.527 and 4.516 billion,respectively.The social effect at each stage is beyond moderate and good.It can be seen that thirty years over all soil and water conservation achieves considerable benefits in southern Jiangxi Province.