The reliability analysis is performed for 54 composite girders. The statistical parameters of the load carrying capacity (resistance) for composite steel girders were derived by Nowak (1999). Ultimate moment and shear limit state equations are considered for interior girders. For moment carrying capacity, the bias factor and coefficient of variation are 1.12 and 0.10, respectively. For shear capacity, the bias factor and coefficient of variation are 1.14 and 0.105, respectively.