In order to improve the peak-load regulation capability of distributed combined cooling heating and power(CCHP)system and adapt to the active control and management of active distribution network, a high efficient distributed CCHP system for active distribution network is presented. The system can run at a coordinated mode, in which the heat and power are decoupled and concerted, and the system can adjust the peak of power grid and reduce abandoned wind, water and light. Meanwhile, the system can deeply recycle the waste heat of the flue gas of the engine and greatly increase the energy efficiency. The flow chart and the operation mode of the system are described in detail, then the energy efficiency and the economy are evaluated. Simulation calculation is done in a specific case to analyze the operation characteristics of the system according to the heating, cooling and power load. Results show that the energy-conservation ratio of heating of the system is 13.4% and the annual energy-saving ratio is 6.6%. According to the current energy prices, the economy of the system is not much different from the conventional CCHP system. The influence of tariff on the economy of the system is relatively large. The thermoelectric ratio is normaly 1.5 to 2 times of the conventional CCHP system, at most 2 times bigger, which can alleviate the intergration pressure of power grid.