This article put towards an opinion from an new approaching by the study of the biography of the Master of Fazhao and the relationship between the legends of his heavenly induction story in Wutai Mountains and his missionary life as a Buddhist preach by demonstration the Pure-Land Sect recorded in the Buddhist history classics, especially took the reference to the Dunhuang Document P.2130 which helps a great deal for providing the unnoticed information to explanation and definition on the clear outline of the date for his preaching life in Bingzhou and the definite time of his invitation by the emperor of the Tang to Chang’an.