Abstract: An impact damage tolerance reliability analysis method was discussed for composite structures by introducing an impact threat concept. The method was applied to the damage tolerance reliability evaluations of domestically produced composite laminates and stiffened panels such as T300/5405, T300/QY8911, T300S/9511, T800/9511 and T300/9512. The example reliability calculations indicate that the damage tolerance capability of composite structures could be taken fully since the impact threat distributions are considered in the present method.