Xiamen Bay undersea tunnel survey of Xiamen and Zhangzhou inter-city Railway R3 line, the hydrological situation in this area is complex, it is necessary to timely adjust the drilling operation according to the tide, water flow, wind direction, wind wave size, and take into account the waterway, night construction and other complex conditions. A total of 500.6m drilling has been completed, and field tests such as standard penetration test, cross plate shear test and pumping test have been completed.