Introduction: this study is conducted to investigating the efficacy of short term dynamic psychotherapy on Love Trauma Syndrome (LTS) on female students. LTS is included a set of signs and symptoms which appears after a collapse in a love relationship and disrupt person's functions intensively, extensively and sometimes becomeس a longstanding problem in person's life. Rechard Rosse (1990) introdued love taruma syndrome for the first time. Method: This project is a kind of multiple – baseline experimental single case study (Kazdin, 1992). Sample includes five cases and they are selected based on purposeful sampling. This intervention is conducted based on McCullough's manual for short term dynamic psychotherapy. McCullough's short term dynamic psychotherapy was prepared for restructuring defences, affects and attachments (McCullough. 1997). In general, this study have three phases. The first phase is baseline evaluation, the second phase is intervention and the third phase is two months of follow up. Intervention includes 20 weekly therapeutic sessions (each session 45 minutes) based on the manual. Instruments in this research are Love Trauma Inventory (LTI), Beck Depression Inventory (BDI-II), Global Assessment Function(GAF) of DSM-IV and Millon Personality Inventory (MCMI-II). Two methods, clinical significance and recovery percent formula are used for data analysis. When individual's scores in target problems decreased to the normal level, it concluded that results clinically are significant. In other words, individual's scores in inventories must decrease below the cut-off point to be consider clinically significant. Recovery percent formula is one of the methods to assess client's progress in decreasing target problems. More than 50% recovery in results is considered clinically significant (kazdin, 1992). Key words: love trauma syndrome, short term dynamic psychotherapy.