The invention relates to the technical field of basic design, and discloses a BIM technology-based basic design method. The method comprises the following steps that 101, a basic model is created in Revit, and a basic analysis model is assigned; 102, all parameter information needed by basic calculation is input into the Revit; 103, the basic model is analyzed in the Revit, and an intermediate file is formed; 104, the intermediate file is led into basic calculation software for calculation, the calculation result is analyzed, if the requirements of design specifications are met, the next step is executed, otherwise, the step 101 is executed for modification; 105, the calculation result is read in the Revit, and a basic graph is generated. By means of the method, the basic design efficiency can be improved.