In the previous studies on compound channel flows, experimental channels of simplified plan shape, straight or uniform sinuosity have been used. However, rivers generally consist of reaches of different plan shapes continuously. Therefore, it is important to clarify as a whole effect of channel shape and hydraulic condition on flow and bed formation. In this paper, effects of plan shape and relative depth on sediment discharge were examined And characteristics of flow and bed topography were investigated in a compound channel consisting of different plan shape (straight, curved and meandering). As the results, sediment discharge in compound straight and meandering channel showed a different manner with relative depth variation. And flow and bed topography were affected mainly by the upstream channel shape. Especially, at transition section from straight to meandering maximum scouring occurred due to non-equilibrium of sediment discharge with large relative depth.