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Uncertainty theory is a branch of mathematics for modeling uncertainty in human reasoning.Uncertain statistics is a methodology for collecting and interpreting experts experimental data by uncertainty theory.Uncertain set is a set-valued function on an uncertainty space, and attempts to model unsharp concepts.Membership function is used to describe the membership degree that a value belongs to the uncertain set.In order to estimate the membership function for an uncertain set via multiple experts experimental data, this paper presents a new method by combination of the method of uncertain statistics and Delphi method, and gives some examples to verify the method.