From 1915 to 1920,Mao Zedong wrote six letters to Li Jinxi who was his teacher at Hunan First Normal School.These letters showed their profound friendship of teacher-student as well as friends.Li Jinxi meticulously cared about Mao Zedong’s daily life and study and Mao also concerned about Li’s health,academic research and political attitudes.They discussed many issues,such as "moral,intellectual and physical development","origin and source theory","autonomy of Hunan Province" and "writings in the vernacular".It could be found from these letters that Mao Zedong’s ideology and character had been basically shaped before the founding of The Communist Party of China.It also could,from these contingencies,get a glimpse of Mao’s some lines’ and styles’ necessity after he became Chairman of China.