Abstract: During the pushing-bending operation of the U-shaped tube，it is possible that the bending radius dimensional deviation is affected by the difference of rebounding that is caused by slight differences of the tube’s O.D.，W.T.and heat treatment properties.To avoid this undesirable condition，the method of bending-rebound dynamic compensation is used to find out the rebound amount that is needed for controlling or compensating the bending during the U-shaped tube pushing-bending operation so as to guarantee the accuracy of the tube’s bending radium.The actual measurement result shows that thanks to the real time dynamic compensation，correction value of the said U-shaped tube’s radium can be more than 25%.