Objectives: The purpose of this study was to investigate the Rorschach oral dependency(ROD) of borderline personality disorder(BPD) patients. Method: In this study, Rorschach oral dependency scores were compared with normal group and frequencies of ROD scale subcategories in each group. In addition, for providing usefulness of ROD to understand BPD, we investigated relationship between the MMPI clinical scales and the ROD scores. The subjects were 20 patients diagnosed as BPD, and 20 normal persons. Results: First, BPD patients had significantly higher ROD scores than normal group. Second, there were not significantly differences of ROD scale subcategories` frequencies between BPD patients and normal group. Third, BPD patients` ROD scores were positively related to MMPI Scale Hs, D, Hy, and Pt. Conclusion: We might speculate that BPD patients have excessive needing dependent. And ROD scores of BPD patients related in neurotic defense mechanism more than their primitive defense mechanism.