ABSTRACT Majiaheba isolated rock mass has distinctive geological background and structure of rock mass, whose potential deformation and stability are important to Xiluodu hydroelectric station.

Generalized Collin principle of an isolated conductor and multi-conductor systems;

In current teaching, discussion on charge distribution on the surface of an isolated conductor is only the qualitative study in special conditions, which cannot explain conductor in general conditions.

The demonstration of the direct ratio between the potential of the isolated conductor and the qualtity of electricity will enrich our knowledge in the relation between electrostatic field and field source.