The purpose of this study was to measure whether the grip cenrte lines pass through the center of gravit yof driver head at the golf ball impact moment or not. As resusl tof the high speed camera experiment(1, 000frames/sec), the data have shown that the grip center lines at ball impact pass through the back of the headcenter of gravity when measuring the from the head face. The raeson of that was because of the reboundfrom the shaft backward bending while downswing the driver with the maximum shaft bending at top.