Abstract: The ultrasonic CT technology is proposed to test concrete filled steel pipe. Firstly, on the horizontal orientation, using sector testing of concrete filled steel pipe at some degree was approved; which was verified by ANSYS simulation. Also, the influence of steel pipe and ultrasonic pulse width was analyzed. Secondly, on the vertical orientation, the wave front and the travel time were analyzed. The condition of restriction of ultrasonic CT technology applying to concrete filled steel pipe testing was obtained.