Abstract: The connectivity experiment was carried out to research the source and the flowing of the leakage water in the Kunlunshan Tunnel.The mechanism of leakage was analyzed deeply based on the experimental data,and some opinions were put forward.The basic methods for the treatment scheme has been offered based on the experimental study and analysis.Finally,the formulation and the implementation of the treatment scheme were introduced.It was shown by the measured effect with some means such as the geological radar,etc.that the treatment has reached the anticipated result.