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Improving the performance of the ultrasonic ranging is the key problem in the ultrasonic position technology. Different hardware and software will lead to different ultrasonic ranging accuracy. The paper aims to a specific hardware system called Hexagon Ultrasonic Array to design the ranging experiments. First analyze the property error source which will affect the ranging accuracy, such as the synchronous time error, the ultrasonic detection error, the sensor hardware design error and the environment effect. Then adopt the temperature compensation method and the least square regression method to revise the measured data. Finally the experiments show that the maximum ranging distance reaches 15 m, and the least square regression method can effectively reduce the ranging error.