The expression 'Resistance capacity' in bridge engineering indicates the certain qualitative level of important characteristics that a bridge possesses, against the various types of action or load. Even if the bridges are constructed with similar feature, the resistance capacities evaluated from these bridges are different due to the uncertainties. This study focuses on presenting a resistance capacity model of bridge which considers the uncertainties caused from the statistical characteristics of bridge members. The developed model is applied to evaluate the lifetime safety/reliability of a bridge. Based on the result of this evaluation, this study aims to improve the effectiveness of bridge maintenance works.