A mop including a spinning member, a spiral rod, an extendable rod, a mop head, and a pressing rod is provided. The spinning member includes a first end, a second end opposite to the first end, and a spiral hole axially configured through the spinning member from the first end to the second end of the spinning member. The spiral rod is further provided with a unilateral bearing sleeved over the spiral rod. The spiral rod is sleeved inside the pressing rod. In operation, the mop is put in a basket which is free for rotation and is axially then applied with a downward pressure, and the extendable rod is withdrawn inside the pressing rod. The extendable rod thus synchronously carries the extendable rod, the mop head and the basket to rotate, thus applying a centrifugal force to remove the water content contained in the mop away from the basket.