Abstract: Abstract： Objective: The aims of this study was to assess the influence of the orthodontic on patients and parents. Methods： 140 patients were rondmised selected from stomatology of hospital wenzhou medical university and divided into two groups: awaiting treatment group and re-visitor group. Spielberger's 'State and Trait?Anxiety?Inventory' (STAI) were applied to both groups. To compare the two groups and to determine the differences between males and females, independent-sample t-tests were used. Results: Trait?anxiety?levels of parents and state?anxiety?levels of subjects who were about to start?orthodontic?treatment were both high. The difference between the groups was statistically significant (P < 0.05). Conclusion：orthodontic could decrease the patients anxiety level.

Key words: Dental anxiety, orthodontic, State and Trait?Anxiety?Inventory