In reliability design and maintenance plan, determining statistical distribution type of interrelated structure is a very important job, and it is always determined through reliability test, which are time-consuming and needs a large number of tests. In this paper, a method determining statistical distribution function was proposed through the experimental data of the Creep Behavior. This method uses the test data; the results of Larson-Miller Method obtained from the data from experiments, and use the least-squares linear regression to get the parameter of common probability distribution function, such as Weibull Distribution, Lognormal Distribution and Normal Distribution. Statistical function of structural failure data was derived through discussion and comparison of results from various methods. The examples proved the validity and usability of this method.