Technology of uncertainty and reliability analysis has been widely used in the systems of water resources and civil engineering. One of the core computations is normal transformation of random multi-variables. In the most of case,the technology of transformation is based on the normal multivariate. This paper presents an investigation about the potential usefulness of polynomial normal transforms technique for uncertainty and reliability analysis of civil engineering systems. Results from the performance evaluation of the polynomial transform under various conditions have indicated its good capability in preserving the characteristics of many distributions commonly used in engineering reliability analysis.