In order to understand the photosynthetic characteristics of Chinese Kale (Brassica oleracea L. Alboglabra Group), 3-month old 'Chui-Chun' plants grown in net house in Taichung District Agricultural Research and Extension Station were used as experimental materials. The effects of light intensity, carbon dioxide concentration, leaf age and diurnal changes of environment on net photosynthetic rate (Pn) were studied. Light compensation point, light saturation point and maximum net photosynthetic rates were 68 μmol．m^(-2)s^(-1), 1,200 μmol．m^(-2)s^(-1), and 22-23 μmol．m^(-2)s^(-1), respectively. The CO2 response curve showed the CO2 saturation point was 1,100 ppm while the net photosynthetic rate was 36 μmol． m^(-2)s^(-1), which was 89% highter than those of control (380 ppm). The photosynthetic rates of 10 to 30-day leaves were significantly higher than those of 50-day old leaves. Diurnal photosynthetic rate reached the peak at 10:00 to 11:00 am. The diurnal changes of Pn was associated with light intensity and temperature in cloudy day.