The invention relates to a controllable device load characteristic modeling method and system, wherein the method comprises the steps of: collecting the power information of a controllable device, and generating a load curve according to the power information; optimizing the load curve according to time optimal step sizes, and obtaining the optimal load curves of the controllable device; dividing the optimal load curves to obtain the one-dimensional working condition vector of the controllable device, wherein each element in the one-dimensional working condition vector corresponds to the work state of the controllable device in each time optimal step size; and obtaining the load characteristic model of the controllable device according to the one-dimensional working condition vector. The controllable device load characteristic modeling method and system can not simplify a present model, and are not restricted to the concrete form of the controllable device; accordingly, the controllable device load characteristic modeling method and system can describe the controllable device more comprehensively and more accurately, have greater expansibility, and adapt to various future resident household controllable devices in a large quantity.