With the advancement of electricity market reforms，load aggregators have gained significant opportuni- ties due to their important role as a bridge between connected systems and end users． The physical constraints and the daily load cap constraints of Load Curtailment，Load Shifting，Utilizing Onsite Generation was considered in the load integrator scheduling optimization． The branch and bound method was used to ensure that the optimal solution was found，so as to determine the optimal scheduling strategy of the load integrator in the energy market． Finally， examples were given to analyze the impact of load integrator scheduling on physical constraints and joint scheduling constraints，which provide a theoretical basis for the actual scheduling of load aggregators．