In order to improve the performance of the ultrasonic atomization, the effect of the flow mode of the carrier gas on the atomization characteristics were examined. The rectangular vessel was used to make the two-dimensional now pattern, and water and nitrogen were used as the liquid sample and the carrier gas. The flow direction of gas to the fountain jet and the heights of gas inlet and outlet were combined and the flow rate of the accompanied liquid was measured. The flow pattern of the liquid droplet around the fountain jet was affected by the flow direction of the carrier gas. When the height of the gas outlet was located at the middle height of the fountain jet, the flow rate of the accompanied liquid had a maximum and the median diameter of the liquid droplet had a minimum. The countercurrent of the carrier gas is effective for the improvement of the performance of ultrasonic concentration.