The advanced technology of environmental control system(ECS) from Boeing and Airbus was introduced. A new concept for ECS was raised, which applied vapor cycle refrigeration with frequency scroll compressor using refrigerant R134a. ECS penalty was calculated with the method of take-off gross weight. And the calculation and qualitative analysis were done for the new ECS energy consumption in the whole flight profile. Then the performance of the new ECS was compared with current ECS in fuel consumption. The results show that new system consumes less fuel(only 21.93�Wkg/min, about 40% of traditional system), which could increase aircraft economic performance. And the health and comfort in cabin could be improved with the low noise, flexible regulation and clean air-supplying.