Based on the annual production data collected by the Statistic Center of the Ministry of Railways of the People’s Republic of China,we calculated the energy saving and direct emission reductions of CO_2,soot,SO_2,CO,NO_x and C_nH_m of electrified railways,and analyzed their dynamic characteristics during the period of 1975-2007.The results show that during this period,the annual mean values of energy saving is 1.23×10~6 tce,and direct emission reduction of CO_2,soot,SO_2,CO,NO_x and C_nH_m are 4.267×10~6 t,20.5×10~3t,3.0×10~3t,9.6×103t,67.9×10~3 t,and 6.9×10~3t per year,respectively.The annual average increasing rates of energy saving is 139×10~3 tce,and direct emission reduction of CO_2,soot,SO_2,CO,NO_x and C_nH_m are 483×10~3t,2.3×10~3t,0.34×10~3 t,1.1×10~3t,7.7×10~3t and 0.78×10~3t per year,respectively.The electrified railways have played an important role in decreasing the energy consumption and air pollutant emissions of China’s railway system.The results of this study could provide some reference knowledge for future reductions of energy consumption and waste gas emission in China’s railway transportation. Based on the annual production data collected by the Statistic Center of the Ministry of Railways of the People’s Republic of China, we calculated the energy saving and direct emission reductions of CO_2, soot, SO_2, CO, NO_x and C_nH_m of electrified railways, and analyzed their dynamic characteristics during the period of 1975-2007.The results show that during this period, the annual mean values ​​of energy saving is 1.23 × 10 ~ 6 tce, and direct emission reduction of CO_2, soot, SO_2, CO, NO_x and C_nH_m are 4.267 × 10 ~ 6 t, 20.5 × 10 ~ 3t, 3.0 × 10 ~ 3t, 9.6 × 103t, 67.9 × 10 ~ 3t, and 6.9 × 10 ~ 3t per year, respectively.The annual average increasing rates of energy saving is 139 × 10 3 tce, and direct emission reduction of CO 2, soot, SO 2, CO, NO_x and C_nH_m are 483 × 10 3 t, 2.3 × 10 3 t, 0.34 × 10 3 t, 1.1 × 10 3 t, 7.7 × 10 ~ 3t and 0.78 × 10 ~ 3t per year, respectively. The electrified railways have played an important role in decreasing the energy consumption and air pollutant emissions of China’s railway system.The results of this s tudy could provide some reference knowledge for future reductions of energy consumption and waste gas emission in China’s railway transportation.