Objective: To compare the depression between the Nationality Dai and Han then Analysis its reason. Methods: Self-Rating Depression Scale (SDS) was adopted to survey192 Han people and 179 Dai people. Results: ①The scores of depression on Dai people was significantly lower than Han people（t=434 p<005）. ② On depression degree , The scores of no depression status about Dai people（6816%）was significantly higher than Han people（3281%）. On mild depression level, the scores of Dai people（2235%）was lower than Han people（3229%）. On moderate depression level, the scores of Dai people（893%）was lower than Han people（30.21%）.On Severe depression, the scores of Dai people（056%）was lower than Han people（469%）. ③The depression scores of religious believers on Dai people was significantly lower than non-believers of Han people（t=1347，p<000）. ④ The depression scores of religious believers on Dai people was significantly lower than non-believers of Dai people（t=1106 p<001）.Conclusion: The level and degree of depression on Dai people was significantly lower Han people. The level depression on Dai religious believers was significantly lower than non-believers of Da1 and Han. The author Infer the reason was religious beliefs have a certain role in psychological adjustment to Dai people.