With the development of modernized port and large-scale ships, the handling efficiency of coastal container terminal is increased rapidly, which has a great impact on the channel utilization ratio. Therefore,the relationship between port handling efficiency and channel utilization ratio is studied emphatically using system simulation technology. The results show that increasing the handling efficiency appropriately can increase the utilization; While improving the handling efficiency to increase the port capacity, we must consider the impact on the channel utilization, otherwise it will result in high channel utilization, channel congestion and reduce the level of channel services. For the scale of berths in the instance, the proposed handling efficiency rate should not exceed 13%.