With the proposal of carbon peaking and carbon neutrality, the adjustable load plays an important role in the power balance of new power system. Firstly, the current load characteristics and the future development trend are studied, and the development trend and problems of the balance of gird under the background of new power system are analyzed. Based on the analysis of the adjustable load potential of typical users, the calculation method of adjustable load considering the balance of electricity is proposed, and the influence relationship between the maximum adjustable capacity, adjustable time and the balance of electricity is quantified through a numerical example. Finally, the development direction of adjustable load under the background of new power system is prospected.