According to A 2-Factor BIS-BAS Model of Chronic Pain, pain or pain-related clues activate BIS because pain is experienced as aversive by most individuals. This BIS activation would facilitate negative cognitive processes, negative mood and behavioral inhibition related to pain, which can be controlled through adaptive cognitive emotion regulation strategies. The typical cognitive emotion strategy commonly found in (chronic)pain patients are rumination can be divided brooding and refection. Brooding is a passive comparison of one’s current situation with some achieved standard. Reflection is a purposeful introspective attempt to engage in cognitive problem solving process. The purpose of this study was to experimentally investigate the differential effects of BIS level(high, low) and types of Rumination(Brooding, Reflection) on pain outcomes(tolerance, retrospective pain intensity, threshold, 15 seconds pain intensity, and pupil response). 62 healthy university students with a BIS scale score of more than ±1.5SD were recruited and randomly assigned to either the Brooding condition or the Reflection condition. The results showed that Reflection conditions in the BIS high group significantly improved the participants'' pain tolerance and reduced their retrospective pain intensity. Furthermore regardless of BIS level, Reflection conditions reported higher pain threshold than Brooding condition. The pupil dilation was larger for the BIS high group in the period from 11s to 19s after participant’s immersed their hand in water. These results suggest that subjective pain experiences may change depending on the type of rumination in the BIS-high group, and pupil response may be affected by personality traits after a certain point in time when pain began to be experienced.