发源于河北省涞源县太行山东麓的拒马河流经北京市房山区，流至张坊镇分成南北二支，北支称北拒马河。北拒马河顺涿州而下与大石河、小清河汇流南折流至白沟镇。因此，涿州因山区泄洪造成大量积水。

dengyongbiaoshi，guoneimouxiezhongyaocaixinxizixungongsidegongnengkaishibianzhi，conggangkaishicongshijiagefabu、jiaoyicuohe、tigongcangchu、maifangcaigou、daimaifangxiaoshouzhuanbianweiliyongzishenxinxiyoushijinxingzhongyaocaichaozuo，shenzhiyuyinjinzibenduizhongyaocaishichangjinxingcaokong，tuidongyaocaizhangjia。邓(deng)勇(yong)表(biao)示(shi)，(，)国(guo)内(nei)某(mou)些(xie)中(zhong)药(yao)材(cai)信(xin)息(xi)咨(zi)询(xun)公(gong)司(si)的(de)功(gong)能(neng)开(kai)始(shi)变(bian)质(zhi)，(，)从(cong)刚(gang)开(kai)始(shi)从(cong)事(shi)价(jia)格(ge)发(fa)布(bu)、(、)交(jiao)易(yi)撮(cuo)合(he)、(、)提(ti)供(gong)仓(cang)储(chu)、(、)买(mai)方(fang)采(cai)购(gou)、(、)代(dai)卖(mai)方(fang)销(xiao)售(shou)转(zhuan)变(bian)为(wei)利(li)用(yong)自(zi)身(shen)信(xin)息(xi)优(you)势(shi)进(jin)行(xing)中(zhong)药(yao)材(cai)炒(chao)作(zuo)，(，)甚(shen)至(zhi)于(yu)引(yin)进(jin)资(zi)本(ben)对(dui)中(zhong)药(yao)材(cai)市(shi)场(chang)进(jin)行(xing)操(cao)控(kong)，(，)推(tui)动(dong)药(yao)材(cai)涨(zhang)价(jia)。(。)