1. Mirror EDM can realize the vertical corner of the workpiece; This cannot be realized by milling, because milling must have R angle.

2. No huge machining force; Therefore, the machine tool is relatively light and does not need to be installed according to the foundation.

3. It can process any hard, brittle, tough, soft and high melting point metal materials.

4. There is no cutting force in EDM; Therefore, the processed material has no deformation, which can well ensure its machining accuracy.

5. There is almost no influence of heat during machining, so the heat affected layer can be reduced and the workpiece quality after machining can be improved.

6. The tool electrode material of EDM does not need to be harder than the workpiece material, so the tool electrode is easy to manufacture.

7. Spark machine can process workpieces with high hardness; Generally, hard cutting tools are used to process more flexible objects, while electric machining uses soft electrodes to process relatively hard workpieces.

8. EDM is non-contact machining, that is, the tool electrode is not in contact with the workpiece during machining; Compared with other processing methods, it will not cause hard damage to the workpiece.