The application of building adjustable load has the problems of lack of census means, low practicality of load model and non-standard communication interface, which restricts its development. For this reason, a tree census system is proposed as the logical framework of the census program. Then the load regulation model at the system operation level is built under the general constraints. Finally, the information exchange specification of building adjustable load participation in power demand response under the physical architecture of the cloud-tube-edge-terminal is designed. The key technical routes and solutions for the application of building adjustable load are given. The experimental results verify the feasibility of building adjustable load to participate in demand response peak-shaving and valley- filling scenarios. In the next stage, through the implementation of the actual adjustable load survey and the construction of software and hardware capabilities of demand response, the building’s adjustable load potential will be further tapped and become an important part of the user side of energy Internet.