Abstract: The train of de Broglie＇ s phase wave theory of uniform motion particle is introduced and explained. Another way to the phase wave theory of uniform motion particle is given. On basis of the phase wave expression of uniform motion particles, phase invariance is discussed and proved. Then according to phase invarianee, de Broglie energy-frequency relation and special relativity theory, the angular wave number of the static particle equal to zero is deduced,and then the de Broglie momentum-wavelength relation, the phase velocity formula, and even the conclusion that the group velocity equal to the particle velocity are deduced. Broglie＇ s theorem of phase harmony and its applications, and clarified some false rumor about de Broglie are introduced.

Key words: phase wave, phase invariance, energy-frequency relation, momentum-wavelength relation, theorem of phase harmony