Hello,
When I export the document to PDF, the background color doesn't appears in the pdf.
I'm a new Indesign user. Ihave searched every where, but i have not found tutorial about this problem...
EM2C
I suggest you try an InDesign forum. You aren't using ExportPDF, which is a special subscription service for people exporting PDF to Word etc.
How did you implement this "background color"?
If, as I suspect, you changed the [Paper] swatch, then you aren't seeing a malfunction. That swatch is non-printing, and will not show up anywhere but in the InDesign editing environment. To add a color in the background, you must actually fill an object with the color and position it behind the rest of the elements in your layout.