Current inference theory under imperfect data and incomplete information is usually applied to the process of solving a specific problem. Therefore, inference theory may not be suitable for application in civil engineering issues with many uncertainties. This paper analyzes three types of uncertainties that exist in civil engineering domain, namely: probability, fuzziness and incomplete information. With the theory of Dempster Shafer, the authors put forward an inference method using imperfect or missing data. This method does not only answer the question of two values and the uncertain indication of continuous values, but also the indication of uncertainty of the "unknowns". The method described here can produce estimates for three kinds of uncertainties as a whole.
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