The purpose of this article is to find the internal solution for improving moral from the viewpoint of Ayatollah Mesbah Yazdi. Improving morality means acquiring moral virtues and eliminating moral vices. In order to achieve improving morality, internal factors and external factors are effective. In Ayatollah Mesbah Yazdi's view, what is the internal solution for improving morality? In this study, the works of Ayatollah Mesbah Yazdi were investigated by descriptive-analytical method and the internal solution of Improving morality was extracted from it. The process of improving morality in a simile is like the realization of a verb. The stages of the realization of the verb are insight, tendency and will to perform the verb. Improving morality also has these steps. The stage of insight consists of Insight into the components of faith, man's relationship with God and purpose. These insights create a tendency towards purpose and a tendency to verb. These tendencies lead to the realization of the required actions for improving morality. The researcher concludes that insight is important for improving morality, but it is not the complete cause for improving morality, Insight should be accompanied by action, and they make it possible to improving morality together.