In the mass-energy relation of the Relativity Theory, the Hamiltonian quantity of the low speed particles in three typical potential fields is joined with a perturbation.

According to Einstein s narrow Theory of Relativity,there is a close relation between mass and energy,that is the so-called mass-energy relation.

A new interpret,based on the relative mass-energy relation and the antiparticle theory and CPT theorem by Dirac in the framework of relativity theory of the function Ψ of Klein-Gordon equation is given.

Inquiry of experimental basis of mass-velocity relation;

The coordinate transformation about the classical electromagnetic mass has been researched, and the ‘intrinsic’ motion in the space where the energy flux density are equal to zero are discovered The mass-velocity relation of the electromagnetic mass of charged particle is discussed, and the results are the same as those obtained by the method on the particle collisio

This paper, from phase non-changeability, deduced the mass-energy relation formula and mass-velocity relation formula, different from conventional method in the textbooks, which are simple and easily accepted by the students.