Abstract: Baihe River, which is located at the suburban of Beijing, was selected as the study object. This paper focuses on a field investigation conducted in 12 river channel bars, which were seldom disturbed by human being. Data about formation and distribution characteristics of channel as well as its influence on increasing biodiversity had been analyzed. The results showed that river channel bars had the effects of increasing river cross section forms and biodiversity. Considering the present situation that urban river ecological system is fragile, it is feasible to make ecological reconstruction on urban river by the way of constructing artificial channel bars. Besides the construction principle of channel bars was proposed on the basis of study with the proposing of three construction methods, i. e. “straight beach model冶, “corner beach model冶, and “group beach model冶, aiming to provide reference for urban river ecological management and reconstruction