Chinese people since ancient times have the concept of drinking tea can prevent the diseases. Recent epidemiological evidences have suggested that green tea consumption may be associated with a reduction in blood cholesterol level, cardiovascular diseases and cancer. The purpose of this study was to investigate the effect of green tea consumption on human physiological parameters, such as blood pressure, heart rate, heart rate variability parameters(Standard deviation of all NN intervals, SDNN, The square root of the mean square successive differences between adjacent RR interval, RMSSD, total power, low frequency power, high-frequency power, normalized low-frequency power, normalized high-frequency power and low / high-frequency power ratio) and brain wave(δwave、θwave、αwave、βwave). Paired t-test was used to compare the differences between the control group (hot water) and experimental group(green tea) on physiological parameters in the pretest and posttest. The experimental results showed that green tea consumption can reduce subjects' heart rate, but did not induce significant difference in blood pressure. About heart rate variability, green tea can induce an increase in SDNN, RMSSD and high-frequency power. It means that green tea can promote the subjects' total heart rate variability and parasympathetic activity to release stress. In brain wave, green tea can induce an increase in both θwave and βwave, it represent that green tea consumption can promote subjects' attention. In conclusion, green tea consumption has many health benefits, including cardiac stimulant, relaxation and attention.