Abstract: Abstract： Objective To investigate the relationship between the chronic periodontitis and the psychosocial factors. Methods A tota1 of 35 patients with chronic periodontitis and 30 periodontally healthy subjects were tested and evaluated by SCL-90, SAS,SDS and LES. Clinical attachment loss(CAL), probing depth(PD), calculus index(CI) were measured in two groups. Results ①SCL-90 results: average scores of interpersonal relationship, depression, anxiety and paranoia in periodontitis group were significantly higher than those of periodontally healthy group (P﹤0.05). ②The self-assessment scores of SDS and SAS in periodontitis group were significantly higher than those in periodontally healthy group(P﹤0.05). ③LES results: the total amount of stimulation from life events and the amount of stimulation from negative events in periodontitis group were higher than those in periodontally healthy group(P﹤0.05). ④In partial correlation analysis, CAL was positively correlated with SDS, SAS and LES in periodontitis group after controlling other variables, while SDS was positively correlated with CI (P﹤0.05). Conclusion The chronic periodontitis patients have more mental health problems, and the psychosocial factors are closely related to the development and progression of the chronic periodontitis.