People perceive intergroup threat when their out-group occupies more resources. Such threat can cause negative cognition and behavior to both out-group and individual. An example of the negative results is a bad performance in a math test under stereotype threat. One valid strategy to buffer the negative effect is self-affirmation. Research on self-affirmation has found that the negative impact of threat can be reduced by affirming a specific value or personality, for self-affirmation is a good way to integrate self. Based on the stress and coping theory, people need to appraise their own resource to cope with stress. As two basic dimensions in self-judgment and self-evaluation, agency and communion are two important aspects of self resources related to capacity and social relationship, which are important resources to cope with the stress from intergroup threat. In light of these considerations, we wish to explore whether affirming self by agency and communion resources will enhance self-evaluation under intergroup threat in two studies. A total number of 67 undergraduates and graduates took part in Study 1. They were assigned to 3 groups(threat with self-affirmation; threat without self-affirmation; control). Participants were first asked to read a web-page and then to fill a manipulation check by an emotion scale. The web-page in threat condition was about 985 schools occupied more resources and the web-page in no threat condition was about the April Fool's Day. After that, subjects in self-affirmation condition answered a 3-item self-affirmation questionnaire while those in control group filled 3 items about diet situation in 24 hours. Finally, all subjects completed the Personal Evaluation Inventory to measure their self-evaluation. Study 2 included 70 undergraduates and graduates as subjects, which employed the same method and materials with Study 1 except for the self-affirmation questionnaire. The two studies leaded to the same results. When there were no self-affirmation, an independent sample t test comparing self-evaluation of threat and no threat condition has significant difference, the self-evaluation of the former was lower than the latter, t(39) study1=-2.86, t(41)study2=-2.87, p<.05. Under threat, independent sample t test in two studies both had a significant difference. Self-evaluation of agency and communion self-affirmation conditions were higher than no self-affirmation condition, t(43)study1=2.84, t(48)study2=2.17, p<.05. The self-evaluation in the threat with self-affirmation condition had no difference with no threat or self-affirmation condition. The results in both studies show that intergroup threat can impair self-evaluation, and both agency and communion affirmation are valid to buffer the impairment on self. To sum up, these findings extend the intergroup theory. At the level of group interaction, intergroup threat can have negative impact on out-group cognition; nevertheless, self-cognition can be impaired on the level of individual process. The results support that the two fundamental dimensions can be the resources to cope with threat, and affirming communion and agency traits can enhance the self-evaluation. However, how self-affirmation works on the relationship between intergroup threat and self-evaluation remains to be explored in future.