To address the problem of insufficient depth information and unnatural interaction by using the current flow visualization application in two dimensional environment， a flow visualization method based on immersive augmented reality is proposed. This method displays the characteristics of flow field changes in the real space through streamlines， uses the immersive augmented reality technology to provide users with effective depth information， and arranges the streamlines through natural interaction methods such as gestures and gaze. And the method uses the Server/Client architecture， in which the server is used for streamline computing and the head-set augmented reality device is used for streamline registration， result display and user interaction. Finally， an original system is developed based on the method. The streamline placement method based on user gaze and the seed placement method based on user gaze and gesture are designed. The interaction methods take advantage of the natural interaction to improve the user’s efficiency in streamline arrangement and data analysis. The results indicate that the method can accurately complete the streamline rendering in immersive augmented reality environment， reflect the change of the flow field and provide users with natural interaction.