The characteristics of different "gauge configuration" were analyzed in this paper drawing out the conclusion that the exit gauge between the cylinder and movable flat shall be determined according to the movement direction of movable flat. When the movable flat rotates clockwise, the exit gauge can be slightly larger while the gauge shall be smaller when rotating anticlockwise. A tapered-gauge technique shall be adopted to determine the gauge between the card cylinder and the movable flat. Parameters that influence the determining of gauge were also investigated.