Often involving the problem of the flow in different angle elbow pipe on the process of water film lubricated transport of super heavy oil, the flow fielde is more complex in elbow tube than in straight one due to the effects of bend curvature. There is speed of deflection and pressure distortion in its flow field, which not only causes loss of energy, but also hase an influence on the stability of water film. CFD software was used to do numerical simulation based on the water film though different conditions of 45° elbow and 90° elbow, after analysis to determine 90° elbow should be selected to increase the line height under this condition. The study provide a guidance to the actual operation and can optimize operating parameters by CFD simulation software.