For high requirement of speed and reconstruction for laser marking system, an effective and easy use file format will play a crucial role.The DXF(drawing exchange format)document structure and the DXF's application in laser marking system based on DSP(digital signal processing)are introduced.The method of ana-lyzing DXF file is stated in details, and the advantages of DXF file in this system will be pointed out.Using the data exchange interface for DXF's secondary development can also make the system to achieve better graphics processing effects.