Retardation of flaming of anatase titanium dioxide in triethylene glycol dinitrate (TEGDN) propellant is studied by the methods of DTA and Closed Bomb Vessel. Results show that TEGDN propellant containing titanium dioxide has endothermic effect caused by crystal type transformation nearby 900 ℃ in DTA experiment,and its burning-velocity falls very obviously in burning experiment at constant volume. X-ray diffraction graphs testify that crystal type of titanium dioxide has changed from anatase to rutile. It can be concluded that there are flame-retardant factors in burning process of TEGDN propellant containing titanium dioxide: titanium dioxide endothermic effect caused by crystal type transformation and surface-covering effect of titanium dioxide particles in TEGDN propellant. It can be utilized to control the burning-laws of propellants,and achieve the purpose of low temperature sensitivity.