Abstract: To explore the Hmong undergraduates on their cultural identity of the ethnic and mainstream culture, 30 Hmong undergraduates were examined using the extrinsic affective Simon task (EAST).The results showed that （1）EAST reaction time scores on the mainstream culture were significantly greater than for the Hmong culture；（2）No significant differences is found in between the mainstream culture and the Hmong culture on EAST error rate scores. Conclusion: Hmong undergraduates have a more positive attitude toward the mainstream culture, and an adaptation strategy of assimilation may have been adopted in their process of cultural adaptation.