Abstract: Along with Hainan economic development at very fast speed,the existing transiting strait vehicle will not be satisfied with request after some ten years, it is necessary to build a settled undersea channel. Based on a great deal of information of the weather, geologic, hydrologic etc on Qiongzhou strait, the suggestion of building Qiongzhou strait railway tunnel is put forward. Moreover, a few tunnel scheme is demonstrated, on this foundation, it is suggested that digging tunnel by using shield method is feasible, and the investment is estimated.