Abstract: The common software of the first-order second-moment reliability method is developed. It can be used to calculate the reliability of the non-linear function with normal, log-normal, extreme and truncated normal statistically dependent random variables. The calculation results show that this method is simple in iteration and converge fast. It can be used in practical engineering design, for example, the structure, mechanism and mechanical part design. This software is developed using block structure method, so it is convenient for further development. The random variables with the other kinds of distribution can be considered by developing the corespondent programs.