Mao Zedong's creative contribution to the construction of the Party's ethos is as follows: on the theory of the Party's ethos constrution of Marxism, in which he mentioned the core concept——the party's Ethos; on the content of the Party's ethos construction, in which he summarized the Party's Three Great Ethos highly and deeply; on the mode of the party's ethos, in which he created a valuable form that connected a regular Thought Reform which focused Movement of setting the Eyhos in Order together. It is instructive to consummate and deepen Mao Zedong's thought of the Party's construction, strengthen and improve the construction of the Party's ethos in the new era on the base of studing Mao Zedong's contributions to the Party's ethos.