Owing to sands allusion,a certain area of new-formed land annually occurred in Yellow river delta(YRD) region.These lands were characterized with rich nutrients,hence usually were exploited as farmlands.However soil salinisation frequently came forth due to drought and high evaporation when these lands were cultivated.Thereby there were various land use systems in YRD area.In order to approach land degradation mechanism,5 typical land use patterns were chosen,soil samples were specifically collected and soil chemical properties were analyzed,soil enzymes(Invertase,Phosphatases,Catalases) activity as well.The results indicated that soil salinity was lowest,nutrition was best,and soil enzymes activity was highest for arable land.For grassland,soil quality became a little bad,as these lands came from degraded farmlands.For shrub land,soil conditions got much more badly,as these shrubs grew in salinized land.In forested lands including pure stands and mixed forests,soil nutrition and enzymes activity were better,salts concentration also was lower,which implied that trees could ameliorate soil conditions to some extent.Among the five land use types,no doubt,soil quality was worst in wild lands.