Abstract: As a new type of flow meter without movable parts, ultrasonic water meter has the advantages of high sensitivity, large measurement range, high repeatability and small start flow. It has been applied to the main pipe network of urban water supply system. However, the ultrasonic water meters using for domestic area has the problems in small pipeline due to the short acoustic path. In order to solve the above problems, the two types ultrasonic water meter with U-shaped acoustic path are designed. The CFD fluid simulation technology is used to simulate the two pipelines. The flow field and pressure drop are studied. The velocity map of the horizontal section and the vertical section are extracted respectively. The relationship of flowrate and flow correction coefficient is analysed at the direction of flow and pipe section. The flowrate variety is also analysed.The simulation results show that the brace pipeline has more stable flow field area and better symmetry. The final experimental results demonstrated that the repeatability and measurement errors of the bracket pipeline are superior to the column pipeline.