Since the Case Payment System should become in a few years the mainstream of the National Health Insurance System that has been implemented this year. This study tries to develop a model of case management as a means to cope with this change in payment policy, with strict cost-effect control while maintaining the quality of care. Taking patients with Benign Prostate gland Hypertrophy (B.P.H) as subjects studied, this study plans to investigate the following issues: 1) length of hospital stay, 2) average of medical fee for each patient, 3) patient satisfaction with nursing care, and 4) outcomes of nursing instruction. From July 1994 to June 1995, a total of 60 patients with BPH, including 33 having TURP operation, 15 with diagnostic biopsy and 12 who were not operated, were included. The case management model took the primary nurse of each individual patient as case manager to make the care plan. Tests were performed with the aid of instruments such as critical path, variance sheet, patient satisfaction questionnaire and nursing instruction evaluation form. Validity was evaluated with expert validity, and reliability was set at Spearment Brownα=.97. Data were collected by case managers on an anonymous base. The findings included: 1) the decrease of L.O.S. from an average of 8.59 days to 6.9 days, 2) the decrease of average medical fee form NT$78,687 to 58,821 3) 100% patient satisfaction, and 4) 98% compliance rate of nursing instruction. The results thus obtained are highly referential to the management for their efforts to integrate health care standards and to develop the critical path for high-risk or high-cost patients.