Physician group practice is more popular in industrialized countries than in Taiwan. A number of studies show that group practice tends to be more efficient than solo practice. This study examines current situation of phy- sician group practice and compares physician productivities in solo and group practice settings. Data were obtained from mailing questionnaires to clinic physicians nation-wide in 1996. A total of 1804 subjects with complet- ed information were included in the analysis. Only 159 physicians (8.8%) were in grouppractice settings. Results showed that group practice clinics hired more ancillary person- nel than solo practice; physicians in group prac- tice settings had fewer working-hours per week and had more out-patient visits. After controlling variables of physician characteristics, clinic features and practice inputs in the model, the multiple regression analysis revealed that physicians in group practice settings had higher productivity than the solo ones (with 16% more patients per day). However, due to the nature of cross-sectional data and the low rate of group practice, implications of the findings should be made conservatively. Results from the analysis suggest that group practice is more productive and might be more efficient than solo practice.