To take effective measures for management of young growth land,the soil structure improver hydropolyacrylonitrile was used to treat Huangmian soil in the experiment.The results show that the effects are very significant that Huangmian soil is improved by hydropolyacrylonitrile,using of which,the production of waterstable aggregates is advanced,soil density is lowered,and soil permeability raised.Moreover,within the concentration range 0.05%~0.40% of the improver,the improvemental effects to Huangmian soil will strengthened with increasing concentration.Also it is preliminarily indicated that using the improver in young growth land might increase soil moisture. Thus it is advisable that soil structure improvers would be applied to tending of young growth in poor site.