A printer (100) includes an ink tank (20), an ink-jet head (10), and a tube (30) connecting the ink tank with the ink-jet head. The ink-jet head includes a top plate (14) and a bottom plate (12). The bottom plate defines an ink storage pool (122) and an ink channel (124) therein. The top plate includes a plurality of control electrodes (142a, 142b, 142c). One end of the ink channel communicates with the ink storage pool, and the other end of the ink channel includes an ink muzzle (124a). A portion of the control electrode (142a) extends over the ink storage pool. The control electrodes are applied with impulse voltages to drive ink in the ink storage pool to move towards the ink muzzle along the ink channel.