Assuming you're asking whether or not you should cover your firewood with a tarp:
The answer is maybe. It depends on a few things such as where you live, how long the wood has been drying, what kind of wood it is, and how dry it is.
If you live in an area with high humidity, covering your wood might help keep it from getting too wet and rot. If the wood is freshly cut, however, it needs to be left uncovered so that it can properly season (dry out).
Certain types of wood are more susceptible to rot than others - for example, cedar is naturally resistant to rot. So if you're using cedar firewood, you probably don't need to worry about covering it.
Finally, if your firewood is already dry (has been seasoned), covering it with a tarp could actually make things worse by trapping moisture inside and causing the wood to start rotting.
So in short, there's no definitive answer - it depends on your particular situation.