In order to obtain flow field information quickly, a kind of technology based on 7-hole probe is designed. It obtains the velocity of the flow field by the probe, and gets the position and attitude of the probe by the Optotrak system, and then the flow field can be graphically displayed by the interpolation of the mathematical tool. The experiment was carried out in wind tunnel. The result shows the device is simple in structure and flexible in use. It can acquire flow field information, and it provides a new method and thought for flow field test.