In 2022, Russo-Ukrainian War broke out. Russian invades Ukraine and this event attracts the attention over the world. Everyone wonders that Russian will use chemical weapon in following attack because Russian has the record that used the nerve agent to poison people. In fact, in human history, chemical weapon has been studied and produced since World War II; since then, more and more types of chemical weapons are used in terror attacks, such as assassinations or wars. The chemical weapons that are used more frequently are sarin, organic pesticides and Novichok.