Based on the Yan gully watershed, authors had emphatically studied on changing chracters of runoff-sediment in process of eco-environment reconstruction. Furthermore, whole sediment yield was accessed in highly harnessed watershed.The results show that harnessed watershed can increase ability of soil infiltration and watershed self-adjust to runoff-sediment. Also eco-environment reconstruction can plused amount of usable water resource. On the other hand, it's sure that eco-environment reconstruction had worked greatly on local environment, compareing with former condition and reducing sediment benefit round about is 83.7% presently.