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Safety inspector often performs duties in circumstances contributes to the oc currence of human failures. Therefore, the paper aims at quantifying human failure pro bability (HFP) of safety inspector during the coal mine operation with cognitive reliabi lity and error analysis method (CREAM). Whereas, some shortcomings of this approa ch that lacking considering the applicability of the common performance condition (C PC), and the subjective of evaluating CPC level which weaken the accuracy of the qua ntitative prediction results. A modified extended method in CREAM which is able to a ddress these difficulties with a CPC framework table is proposed, and the proposed me thodology is demonstrated by the virtue of a coal-mine accident example. The results a re expected to be useful in predicting HFP of safety inspector and contribute to the enh ancement of coal mine safety.