During Iran-Iraq war, all world and regional powers, regardless of their political system, supported Saddam Hussein regime against Islamic revolution. Weaponising Iraq to highly developed weapons was continuing without any attention to the conflicts of the two super powers. After Iran-Iraq war and specially after Saddam's attack on Kuwait and the crisis following it, experts and research centers began reconsidering western states policies and positions about Iran-Iraq war. In these reviews, different aspects of western wrong 1980s policies toward Iran were published and criticized. There are different documents, books, and articles related to this subject. Present article studies on "How US weaponised Saddam by chemical weapons?".