Abstract: Since the 18th CPC National Congress,General Secretary Xi Jinping has repeatedly mentioned "remaining true to our original aspiration" and "keeping our mission firmly in mind" in his speeches,replies,congratulatory letters and signed articles,thus forming an important exposition in Xi Jinping's thought.The formation of it has profound historical logic.First,we should think out of the way from the historical periodic rate.Both the feudal dynasties and the peasant uprisings in history failed to break out of the historical periodic law of  "prospering suddenly,and dying suddenly".The key was that they could not make great efforts to rule,to respect the end as the beginning,to prevent corruption and absolve extravagance,and to conform to the people's wishes.Second,we should draw experiences and lessons from the development history of socialism.The tortuous course of the world's socialist practice tells us that once Marxist parties give up Marxist belief,socialist belief and communist belief,they are doomed to collapse.Therefore,we must always keep in mind our original mission and strengthen the education of ideals and beliefs.The third is to summarize the path to success from the history of New China.The great success of the People's Republic of China over the past 70 years and more is because it has never forgotten to seek happiness for the people,national renewal and greater harmony for the world.Fourth,we should draw wisdom and experience from the history of reform and opening up.The Party's original aspiration and mission are the fundamental driving force for reform and opening up.The Party's original aspiration and mission define the direction for reform and opening up.Only by adhering to the Party's original aspiration and mission can we win the sincere support of the people.Fifth,we should draw strength and nourishment from the history of the CPC.Remaining true to our original aspiration and keeping our mission firmly in mind is the common political philosophy,value pursuit,and eternal and life-long task of Chinese Communists.

Key words: Xi Jinping, "remain true to our original aspiration and keep our mission firmly in mind", historical periodic rate, “Four History” Education