Using Newton's law of gravitational force (gravity is inversely proportional to distance square),this paper establishes the orbit equation of planet and gets the Kepler' Law.This paper also proves that the Chang'e-1 is elliptical in the process of running around the Earth and the orbit of he Chang'e-1 is also elliptical in the process of running around the Moon.This paper briefly describes the Chang'e-1 lunar exploration process and the main mathematical and physical principles of Chang'e-1 in the process of flight.In the course of the lunar exploration Chang'e-1 conducts an Apogee track of changing,three times tracks of changing in near locations,three brakes around the moon.
Key words:elliptic;orbit;gravitational force;Kepler' Law