Soil erosion makes for damages on the farm where it occurs as well as off the farm. The off-farm economic losses caused by soil erosion are considered as macroscopic in nature and very harmful to national economic construction, and those occuring in China are discussed tentatively in the folowing five aspects; 1，Reduction of the use efficiency of stream flow;2，Aggravation of flood damage; 3,Damage to river navigation; 4，Sedimentation_ of reserviors; 5，Shrinkage in lakes' areas.