Abstract: To restrain the increase of total carbon emissions,stabilize the power load fluctuation and improve the coupling degree between energy equipment,an optimal scheduling model of park integrated energy systems considering flexible loads and carbon flows is proposed. And its advantages and disadvantages under different operating conditions are explored. First of all,a scheduling function is established aiming at the optimization of operating cost and carbon transaction cost. Secondly,on the energy supply unit side,the coupling equipment is configured to optimize the complementary benefits among energy sources;on the load demand unit side,the flexible demand response model is considered to smooth the load curves. Finally,the operation model of the built system is scheduled by using the mixed integer planning software. The results of simulation experiments show that the two-way joint optimization of supply and demand of park integrated energy systems can not only effectively reduce carbon emissions,but also further improve the overall system economic benefits.