The fluctuation a and uncertainty caused by large-scale renewable energy, electric vehicles (EV) and inverter air conditionings (IAC) connected to the commercial park microgrid (CPMG) bring new challenges to the flexible operation of the system. The paper presents a CPMG optimal scheduling method considering flexible resources on the demand side. Based on demand response models of EV and IAC, the flexible supply provided by CPMG flexible resources on the demand side is quantified. Combined with the inherent flexible resources and flexible demand of the source side, the index of flexibility shortage severity is proposed to quantitatively evaluate the imbalance severity between flexible supply and flexible demand of the system. On the basis, the CPMG multi-objective optimal scheduling model is established, which takes into account the operation economy and flexibility and solved by CPLEX optimization software. Simulation results show that the proposed model can coordinate various flexible resources on both sides of source and load, and effectively improve the operational flexibility of CPMG.