The present study was designed to examine the role of the perceived culture of the outgroup and the perceiver's cognitive style on the intergroup process. We conducted a survey among mainland Chinese college students to discover the role of their personal endorsement of Hong Kong Chinese's distinctive values and need for cognitive closure in predicting their attitude towards the Hong Kong Chinese outgroup. Results showed that mainland Chinese who gave a higher endorsement of Hong Kong Chinese values were more likely to show a positive attitude towards Hong Kong Chinese, especially for people with a higher need for cognitive closure. These results were discussed in terms of the function of shared social reality on the formation of positive intergroup attitude. Future directions for intergroup research were proposed based on these findings.