The change in daily mean surface air temperature and the diurnal temperature range (DTR = Tmax-Tmin) has a great impact on human health. The daily total mortality risk shows a บ-curve with daily mean temperature. The daily mean temperature with the lowest mortality risk is 26.4° C; temperature either above or below 26.4° c will increase the death risk. If the daily mean temperature is above 26.4°c, the mor¬tality risk will increase by 1.9% and the cardiovascular disease risk will increase by 3.5% with air temperature increasing by l°c, while there is no significant trend to the influence on respiratory system diseases. If daily mean temperature is below 26.4°c and temperature decreasing by l°c, the daily total mortality risk, the cardiovascular disease risk and the respiratory system diseases will increase by 1.2%, 2.5% and 2.0%, respec¬tively. High temperature events above 26.4°c have rapid and short-term impacts on mortality, and their relative risks generally peak in the same day and usu¬ally diminish within about 4 days. In contrast, the cold events with temperatures below 26.4°c have a slow and persistent impact on mortality. The rela¬tive risk generally peaks on the succeeding second or third day and its effects usually persist for 2 weeks or longer [Yang et al, 2012]. Therefore, the protective measures to low temperature should be maintained for two weeks or longer and should not stop immediately after the cold event ends.