This study reinterpreted Tesla’s gravity theory by Dirac's vacuum. Most of the mass in the proton is in the form of energy from color charges field. Dirac's vacuum, in which virtual particle-antiparticle pairs are constantly producing and annihilating repeatedly, is polarized by the electric and color charges contained in the masses. Polarization of the virtual particles leads to rigidification of the vacuum, which leads to paralysis of the vacuum’s function of gravity transmission. This paralysis of the vacuum’s function of gravity transmission between the two masses does not allow the gravitational field lines to pass each other, and finally, causes universal gravitation. For the aspherical anisotropic gravitational field, it is found that the symmetry of universal gravity is not maintained, unlike the result obtained by the principle of superposition. This study interprets universal gravitation mechanism by using vacuum polarization.