Abstract: In order to study the reaction kinetics of uranium with CO or CO 2,uranium samples of different forms are obturated in reaction vessels and then CO or CO 2 is filled in. Gases in vessels are analyzed at different storage time.The experimental results show that the form of uranium,temperature and the kind of gas affect the reaction remarkably. The reaction rate of uranium powder with CO or CO 2 is faster than that of uranium pipe with CO or CO 2. It is advantageous to the reaction of uranium with CO or CO 2 by raising the temperature. The reaction rate of uranium with CO is faster than that of uranium with CO 2 at the same temperature.