A Further Discussion of VGM Theory in the Isotropic Coordinate System

The isotropic coordinate System is used to further discuss "a theory of gravitation by considering the vector graviton field and the metric field"(VGM).The following results are obtained.(1) The "infinite redshift surface" of which the radius r is finite does not exist;(2) The reason is given why the result derived from the VGM theory is different from that derived from the general relativity with respect to the perihelion motion of a planet;(3) The Kepler's third law is modified and the modified result can be regarded as a prediction of the VGM theory.