Abstract: Before the year of 2020,the Chinese Lunar Exploration Program will be implemented in three steps of "Orbiting the Moon,Landing the Moon and Returning from the Moon". This paper shows that the engineering and scientific goal, implementation result and the major technical achievement for the Chang'e-1,Chang'e-2,Chang'e-3 and Chang'e-5 Circumlunar Return and Reentry missions. After that,this paper gives the developing trends of Lunar Exploration Program and system ideas and framework of the future lunar missions.