Qingdao Jiaozhouwan tunnel is 7 800 m, and subsea tunnel is 3 950 m. There are 2 main traffic tunnels and 1 serving tunnel. Accessorial tunnel passing in or out the main traffic tunnel is founded at 2 000 m part from gate in Qingdao. Space between the center lines of the 2 main traffic subsea tunnesl is 55 m. The section is oblong, width is 16 m, and height is 12 m. The tunnel is through slightly weathering granite, dolerite and andesite. Its vertical section is "V"  slope. The maximum seawater depth is 42 m and the minimal rock cover depth is 30 m.The key tunneling technology and configuring big machines of drilling and blast for constructing Qingdao Jiaozhouwan subsea tunnel were discussed in this thesis.