Based on the deepening of China's opening to the outside world,and port as the hub as a distributing center of goods and transfer of land and water,its role also in increasing,port construction is becoming more and more important. Pneumatic caisson can maximaly satisfy the needs of port expansion continued. The paper is pneumatic caisson construction process to elaborate and the existence of the details of the construction are analyzed,hoping to provide a favorable reference of port pneumatic caisson construction,so as to improve the schedule and quality of construction of our country haven.