Introduction: Research evidence suggests that mentalization, the capacity to reflect on the mental states of one's self and others, is impaired in individuals with non-suicidal intentions. The aim of the present study was to investigate the effectiveness of short-term dynamic scanning psychoanalysis on mental retardation in non-suicidal individuals. Methods: For this purpose, within the framework of a single-trial experimental design of multiple lanes with stepped entry of 5 counseling centers in Alborz province using Structured Clinical Interview Diagnostic Tools (SCID-II) and Millon Personality Inventory (MCMI-III) based on the sample method The available treatments were selected and were individually briefed for 20 sessions of intensive short-term psychotherapy in six stages (pre-treatment, after 4, 8, 12, 16 and 20 sessions). 2 months of follow-up were assessed by the mental retardation questionnaire (RFQ-54) and the Self-report Behavioral Behavior Inventory (ISAS). Cohen's index, percentage of remission and effect size were used to determine clinical significance. Results: The results of the data analysis showed that intensive short-term dynamic psychotherapy is effective on increasing subjective and self-injurious behaviors of individuals with non-suicidal intent. Conclusions: According to the results of this study, it can be concluded that intensive short-term dynamic psychotherapy is a good option for increasing the capacity of mentalizing and reducing self-injurious behaviors in people with non-suicidal intent.