We developed a model of timedependent resistance for a steel structure project and discuss herein the expression and the primary value of many parameters in the model. On the basis of the APDL language furnished by universal finite element program, we united the functions of structural and statistic analyses. A timedependent reliability analysis was implemented. The result of the timedependent reliability analysis was compared with that of the no timedependent reliability analysis. Through testing a calculated example, we saw that when the timedependent resistance was considered, the factor of time greatly influences structural reliability. In addition, we found that the model of timedependent resistance for a steel structure is reasonable and feasible.