The utility model relates to an interception structures for river course, include that a. Floats bed portion, float the bed at least one flexible plant and be formed by connecting with the superficial bed of at least one portable plant that two b. Enclose at a distance from interception portion enclosing and separating the body, connect and enclosing the counter weight of connecting at a distance from the ecological substrate net and the ecological substrate net bottom portion of body below, two are enclosed and separate the interception part and do not connect in the both sides of floating bed, the utility model discloses enclose to set up in the interception unit in twice and float sheet unit, through multiple interception, thoroughly improved other interception facilities and interceptd the not good difficult problem of effects, improved the interception effect of system. Utility model is flexible interception system, compares present common rigid structure interception system and has stronger shock -resistant ability, and the effect that blocks water is gentleer, and life is longer. The utility model discloses have and freely to float along with the water level height, do not influence river course flood passage safety, reserve the passageway of navigating simultaneously, ecological environmental protection, the view is effectual.