Q: How can I solve the issue that the text becomes garbled if I open the exported dxf dataset in CAD?

A: The garbled text in CAD is caused by the CAD version selected while exporting the file. The problem will not exist if you select to export the dxf dataset as CAD2000 or higher versions. 
According to this issue, you can solve it with the following solutions: (1) Directly change the font in CAD to Song; (2) Add style for text in the style table.