  The Einstein theories of space-time and gravity as well the stander cosmology
are reconstructed thoroughly in this paper based on flat reference frame. The
rational parts of the Einstein theories are reserved while the irrational parts
including space-time paradoxes and singularities and so on are eliminated
completely. A more rational the theory of space-time, gravitation and cosmology
is established. By transforming the geodesic equation described by the
Schwarzschild solution of the Einsteins equation of gravitational field into
flat reference frame for of gravitational field, it is provdescription, the
revised formulas of the Newtonian gravitation is obtained. Based on the
formulas, all experiments which support general relativity can also be
explained well, but the theory has no any space-time singularity and other
strange characters which exist in general relativity. It is pointed that there
exists logical difficulties to use the equivalent principle to explain spectrum
gravitational redshift actually. The new formula of gravitational redshift and
the revised Doppler formula of redshift when light source moves in
gravitational field are deduced. Based on the Schwarzschild solution of the
Einstein equation field, it is proved that the speed of light would change and
the isotropy of light speed would be violated in gravitational field with
spherical symmetry. It is suggested to use the method of the Michelson Morley
interference to verify the change of light speed and the violation of isotropy
in the gravitational field of the earth. This experiment can be considered as a
new verification for general relativity in the weak gravitational field with
spherical symmetry. The theory may also be used to explain so-called the
Pioneer Anomaly which the Einstein theory of gravitation can not do.
