With the real project of reservoir right shore to an electricity station dam at southwest,and topography,geomorphology on the spot,beginning with geological qualitative analysis,we can initially ensure the upstream and downstream boundary,the front and back boundary of the deformation and fracture mass.According to the heterogeneity and something unknown of the geologic body,we located three measuring circuits which contain lower road,higher shortcut and ordinate on the boundary referred above,then we use two scientific ways of RaA radon survey and VLF survey to test.Ultimately we can get the every observation point radon columnar sections and the VLF apparent resistivity diagrams after coordinating the data in doors,and on the foundation of principium we quantitatively identified them with geological circumstances.As a result,the information we had gotten from those diagrams accorded with the boundary in geological qualitative analysis by and large.It is obvious that the boundary determination of the deformation and fracture mass was illustrated sufficiently on the basis of these two testing method.