Abstract: To check the data of carbon material reflecting neutrons, the distribution of238U fission reaction rates induced by DT fusion neutrons reflected by carbon material was measured by using the small depleted uranium fission chamber and the capturing detector. For comparison,238U fission rates without carbon material was measured too. The combined standard uncertainty of238U fission reaction rate is 5.1%～6.4%. The measured results are consistent with the calculated ones with MCNP/4A code and ENDF/BⅣ library data in the range of the error.