The purpose of this study is to find out the trends of the physician productivity with reference to the patient load. The result of the present study can be utilized for physician manpower planning in balancing demand and supply of health services. The data used in this study was collected from 1,015 physicians working in primary medical institutions by mail survey from September 25 to November 30, 1983. The independent variables chosen for analysis were physician`s age, physician classification, years of practice at the present place, number of medical assistants, hours of work per week, type of location of practice, and minutes of caring patients. The findings of the analysis can be summarized as follows. First, physician patient load was increased by physician`s age of 35 ~ 44 year age group. With 60.6 cases per day, then decreased by increasing physician`s age. Second, the maximum number of cases cared by specialists was 54.2, 49.4 and 34.2 per day. Third, physicians could care more patients by having more medical assistants. Fourth, the maximum number of cases cared by physicians is 52.1 cases in cities in private sector in comparison with 68.2 cases per day in the big city in public sector. Fifth, in accordance with the stepwise multiple regression anslysis, number of nursing aids had most strong power to explain the physician productivity and the other independent variables including physicians age, minutes of first care, physician`s sex, and years of practice have explained variance significantly.