The purpose of this study is to investigate primary unadjusted schemes in patients suffering from obsession-obligation personality disorder with a non-clinical group. To this end, 50 respondents who were randomly selected from a group having obsession-obligation personality disorder (7 females and 18 males) and a non-clinical group (8 females and 17 males), completed Yang’s 90-item questionnaire of primary unadjustedschemes. The results showed that the mean and the standard deviation of the two groups were significantly different in some schemes. The Independent Samples T-Test results showed that the two groups were significantly different in self-sacrifice (t (2, 48) = 4.17; p<.001), emotional prevention (t (2, 48) = 18.81; p<.001), perseverance criteria (t (2, 48) = 18.6; p<.001), superiority (t (2, 48) = 2.82; p<.005), and self-punishment (t (2, 48) = 3.19; p<.005). The results suggest that study of schemes is an effective way for exploring fundamental factors causing personality disorder. It is suggested that further studies investigate other personality disorders.