Ｒegional integrated energy system is the base of energy transformation and solving environmental problem． With the rapid development of electric vehicles in China，electric vehicles，as flexible and dispatchable resources in parks，play a role in peak regulation and promoting clean energy consumption． Therefore，a day － ahead scheduling model of regional integrated energy system including electric vehicles and distributed power supply is established． Firstly，the relationship of energy flow in regional comprehensive energy system is analyzed． Secondly，on the basis of independent modeling of different energy conversion equipment and electric vehicles，the mathematical model is abstracted taking the day － ahead comprehensive economic benefits maximization as objective function． Finally，the economic benefits of electric vehicles participating in day － ahead dispatching of regional integrated energy system are analyzed in the example system．