Signal decaying time of the low-Q type IPBPM is short enough to separately detect each bunch of a multi-bunch beam with 150 nsec spacing. This enables us to build a simple feed- back system to stabilize the second bunch using the adjustable-gap strip-line kicker. Output of the single stage homodyne processor of the IPBPM, which should be proportional to the beam position and charge, was applyed to the kicker electrode after proper delay time and an ampli er. Adjusting the loop gain by beam charge, we have demonstrated to reduce given position variation of the incoming beam by 1/10 at the BPM.