The theme of this thesis is "The Study of Zhang Zai's Ontology and Virtue Cultivation". On the one hand, interpreting Zhang Zai's ontology through the dynamic process of Tài-xū's Ontology and Practical theory . On the one hand, I want interpret Zhang Zai's Virtue Cultivation through the study of changing temperament about learning to become a self-contained person, learning to become a kind, moral, tolerant, lenient and complete Humanity.