In this paper,we describe the deviation of confidence factor about an assertion,the rule intensity deviation, the assertion reliability (the reliable degree about an assertion), the rule reliability (the reliable degree of a rule) ,and the level two uncertainty. Based on these concepts we present an inference method that can deal with the deviation of confidence factor about assertions and the rule intensity deviations,a new reasoning model which integrates the two levels of uncertainty (the confidence factor and the reliable degree).Adiscussion about the evaluation of conclusions given by the cooperative ESs is also in progress in this paper.