Abstract: Objective：To measure the attached gingiva width(AGW) on buccal sides of healthy adults to provide the referencial range of AGW of healthy adults for the convenience of implanting, orthodontic, and prosthodontic treatment. Methods：144 healthy adults were enrolled, who were 20-30 years old, with healthy periodontal tissue and tooth structure, but without systemic diseases and any drug used in the past 6 months. The width of keratinized gingiva and depth of gingival sulcus were measured, then AGW were calculated and the data were statistically analyzed. Results：The WAG of lateral incisor was the most widest, ranging up to 5.2±1.1mm in maxillary, and the AGW of the first premolar was 1.8±0.8mm in mandibular which was the narrowest. The AGW in maxillary teeth were significantly greater than that in mandibular teeth, with statistically significant differences(P<0.05).There was no significant differences of the AGW between both genders (P>0.05). There was no significant difference of the AGW between the left and right sides (P>0.05). Conclusions：The AGW was the widest in lateral incisors, and narrowest in the first premolars. The AGW on maxillary arch is higher than that on madibular arch on the same position. The AGW is symmetrical on the same position of both sides and there is no difference of WAG on the same position between both genders.