The crisscross region of water wind erosion is taken as the main research subjects,the relationship between soil erosion and eco environment change has been studied,the subjects and methods of monitoring research have been discussed.Using methods of typical field investigation combined with site dynamic observation,the characteristics of the climate and water wind erosion and eco envirionment evolution process have been analyzed.Through establishing series runoff plots and climate observatory,soil erosion process under varying landuses and topographical thypes in different conservation practices has been monitored,which includes the change of rainfall,runoff,infiltration and soil erosion amount;the evolution of rill erosion;the relationship between wind erosion and wind power;the evolution of soil erosion and soil degradation.The first observatory of water wind erosion and eco environment has been established in the fragile ecologic environment region of the loess plateau in Shenmu county.