The understanding of the cosmos celestial body and micro elementary particles plays an important role. This paper illustrates the calculation of celestial body's mass involving Kepler's law, Nawton's law of universal gravitation and general theory of relativity. The measurement of micro elementary particles's mass appiles conservation of momentum, law of conservation energy, special theoty, Mechanics, Electricity and Magnetism theories. Obviously the obtain of celestrial body and particles needs some other ...