Using the fluid mechanics software fluent to numerically simulate the two ultrasonic wind transducers at different wind speed, the velocity nephogram， and the curve of the wind speed with time step on the centerline of the transducer has been obtained. And the effects of the two transducers on wind speed are analyzed and compared. Secondly, the rectangular transducer is taken as the research object. At different wind speeds and different wind directions, the variation of wind speed with wind direction on the wind path is simulated. The wind speed curve along the wind direction and the comparison chart of the curve of x component velocity with wind direction and the variation curve of x axis component velocity with wind direction of standard wind speed has been obtained. From these diagrams, we can see the influence of ultrasonic transducer on wind speed under different wind directions. From the simulation results, it can be concluded that the streamlined shape of the bullet-type ultrasonic transducer has less influence on the wind speed than the cylindrical transducer at high wind speed. In addition, the ultrasonic wind path should avoid parallel wind when designing the ultrasonic anemometer, that is, the path of wind measurement should be at an angle to the wind direction, and the angle should be about 60°.