Abstract: The traditional manual drawing of flotation process flow chart has a large amount of repeti⁃ tive work，poor standardization and insufficient versatility. In order to efficiently draw the line flow chart of flotation，through the research and analysis of the operation rules of DXF file entity，the C++ language is used to write the program in the Visual Studio 2022 development environment. The program describes the flow chart structure，reads and directly creates the DXF file，and carries out the secondary development of Auto⁃ CAD，which realizes the parametric drawing of the flotation process flow chart of the single-cycle ore return sequence，and provides examples and associated codes to show the specific operation process.The research results show that the method shows effectiveness，accuracy and applicability for the drawing of flotation pro⁃ cess flow chart，and effectively improves the drawing accuracy and efficiency of flotation process flow chart.

Key words: flotation, line flow chart, DXF, C++, AutoCAD, single-cycle, typical, parameterized