Abstract: Responses of physiological parameters and activity to humidity and temperature were studied using DSI animal physiological parameters on line telemetry system and environmental condition and animal activity detecting system. The results show that body temperature, heart rate of pigs raised under high room temperature in summer, and swine growing performance decreased, especially, under high humidity and temperature. a 10 % increase in relative humidity was offset by 1℃ decrease in ambient temperature. Effects of environmental temperature on body temperature and heart rate are very significant, effect of environmental humidity on body temperature is significant, environmental humidity makes little effect on heart rate of pig.