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The problem of "motion" is one of the issues that arose from the very beginning of philosophy in Iran and Greece, and therefore it became the focus of attention and emphasis of philosophers, and since then until now many treatises and books have been written about it. One of the issues that was studied under this topic is the “substantial motion of things” that Mulla Sadra initiated and proposed. This issue has been criticized and confirmed since the time it was raised and brought up and has provoked both supporters and opponents. He claims that substantial motion is “the motion that occurs in the essence of things”. This article aims to, while referring to substantial motion, briefly state the view of the contemporary philosopher Professor Abedi Shahroudi, which is titled “A Complement to the Theory of Substantial Motion”. In this theory, motion is a compositional motion, and based on the vector motion theory, the shortcomings of Mullah Sadra's theory, some of which have been mentioned in the article, will be obviated. Therefore, first, we briefly examine the substantial motion based on Mulla Sadra's definition, and then we explain Shahroudi's theory with the title “Vector Motion: A Complement to Mulla Sadra's substantial motion.” In Mulla Sadra's opinion, time is an irreversible event, contrary to Shahroudi's opinion that time is a reversible thing. [ABSTRACT FROM AUTHOR]