Abstract: There are seven debris flows in the dam-area of one hydro-power station on Jinshajiang river. Through expatiating on the characteristic rainfall, the condition of channel landforms, the character of relax solid substance, the character of debris flow's district,activity and cumulus, the author generally evaluate the possibility and danger of debris flows . Because this is a super-big power station project, so the analyzing about debris flow's deposit effort and lash destroy effort to the power station are mainly made. Last we think that debris flow which lies at upper reaches of dam-area, the debris flow deposit will be pushed gradually to the reservoir with the process of time, and it does a little effect during the reservoir's normal work. And debris flow which lies at lower reaches of dam-area, it mainly affect establishments and field during construction, so we need take the suitable guiding and draining methods to prevent debris flows combining permanent stability structure.