in the practical application process, two methods are generally adopted in building energy saving calculation. The first is the comparative evaluation method. This calculation method can get the required results by comparing the building shape coefficient, roof and wall structural measures, and the window-wall ratio calculation of the building is relatively simple. Relevant parameters and indicators are given, just apply the calculation. By comparing the result data with the data specified in the code, it can be concluded whether the building meets the energy-saving requirements. This calculation formula is listed in most specifications, so it can be calculated by hand. The second method is the comprehensive evaluation method, which mostly uses calculation software to calculate, and inputs various parameters and indicators according to the requirements of the software to calculate the available results.