Abstract: The cascade utilization of energy can be achieved by combined cooling heating and power (CCHP) type of microgrids, meanwhile the energy utilization efficiency can be improved. Both heat inertia of the building and power interaction among microgrids may have a significant impact on economic dispatching of multi-microgrid system. In allusion to the multi-microgrid containing CCHP systems, an economic dispatching model, in which the heat inertia of heating area and the power interaction among microgrids was taken into account, was built. Considering power interaction among microgrids, in this model the optimum economy of multi-microgrid system was taken as the objective, and the heat dissipation quantity of the heat radiator was added as a control variable, besides the constraint of traditional thermal load balance was translated into the indoor temperature to satisfy the human comfort requirement. And then, both running conditions of the microsource in microgrids and the economy of the microgrid system under different operating modes were compared by the analysis on calculation examples. Simulation results show that overall considering the heat inertia of heating area and the power interaction of adjacent microgrids the output of microsources can be changed so that the economy of multi-microgrids system can be improved.