) was used firstly to map a non-Gaussian structural response into a standard Gaussian process,then mean up-crossing rates,mean clump size and the initial passage probability of a critical barrier level by the original structural response were estimated.

) are used to map a non-Gaussian structural response into a standard Gaussian process,and then the mean up-crossing rate of the original response process for a critical level is estimated from the mapped standard Gaussian proce.

The corresponding coefficient of deviation mean Φp and transcendental probability P are evaluated under different skewness coefficient Cs by deducing Pearson Type Ⅲ probability density distribution function according to the requirement of Military Specification Airplane Strength and Rigidity.

The paper calculates and analyzes the issue by using two methods of transcendental probability and the effective service life of project.

In this paper,the equal exceeding probabilityprinciple is carried out to determine the characteristic value、statistica parameters of variable load.

The success of competition can be gained,besides by promoting the essential competitiveness and gaining distinction,by avoiding the competitive front and achieving higher efficiency.