An uncertain random comprehensive evaluation method based on chance theory is proposed in this paper.Weight value of every evaluated index in evaluated system is charactered as uncertain variable, the corresponding comment remark to every evaluated index is charactered as random variable, The operator is replaced with multiplication.At last, the expected value of comment remark to every evaluated index is obtained by the properties of uncertain random variables.The evaluated result is the comment remark whose biggest expected value.An example is given to illustrate property and validity of this method.