The dental caries and periodontal disease of the two nationalities in these two places were studied respectively, their body build index were measured, and questionnaires about diet structure and other relevant factors were conducted, the nutritional biochemical index were measured too. 分别对两民族进行口腔龋病、牙周病的筛查,体格检查、膳食结构、相关因素的问卷调查,测定相关营养生化指标。