Research on soil anti-erodibility was conducted for the two types of herbages planted on the triploid Populus tomentosa woodland which was converted from cropland to forest.Results showed that the differences in the content of water stable aggregates in high,middle,and low layers were little in comparison with those on ploughed land.However,the contents of coarse water-stable aggregates in high and middle layers on woodland were far more than those on farmland.The content of organic matter for artificial herbage was greater than that for natural herbage,but the difference was not distinct.The content of organic matter is greater than that on woodland due to farmyard manure.The anti-erodibility index based on micro-aggregates is not prominent in comparison with the content of water-stable aggregates,although it shows that the anti-erodibility of woodland is better than that of farmland to some degree.