Abstract: Thermal-elastic dynamic fracture of a hollow cylinder with a semi-elliptic surface crack under thermal stress and impact loading is investigated.The analysis is performed by means of fracture dynamics and finite element method,and a three-dimensional finite element program is developed to determine the temperature field and dynamic stress intensity factor.The results show that the effects of hollow cylinder's boundary surface,crack surface,material inertia and elastic waves play significant roles under impact loading coupled with thermal stress.