Bulb tubular pumps have small hydraulic loss and high pumping system efficiency, which especially suit to the low lift head, large discharge and long running time situation. Bulb supporting units which including manhole and bottom supporting are important flow-passage components of bulb tubular pump. The turbulent flow in a bulb tubular pump with different supporting shapes was simulated by CFD method. The results of the calculation indicated that the shape of supporting has a marked influence on hydraulic loss in the discharge passage and flow pattern. Therefore, reasonable shape of supporting can improve the turbulent flow pattern, reduce the circumference velocity and increase the pumping system efficiency.