considered the problem of construct asymptotic confidence interval for the ratio of means of two two-parameter exponential distributions.Kharrati-Kopaei et al.(2013) consider simultaneous fiducial generalized confidence intervals for differences of the location parameters of several exponential distributions under heteroscedasticity. In the quality control study and the experimental design, a more important parameter of interest is the mean lifespan of certain products. For example, it is known that the product quality directly affects the competitive advantage of an enterprise in the market. The quality of the product and its lifespan are