Can any one help me. They seems to be an issue with each side of the taxi ways the ground is very very blurry.
It's not an issue: is how the scenery is made. Not all ground is covered with a 2nd detail texture layer to give the illusion of increased resolution, but only the parts you are supposed to be on, like taxiways. Not the grass.
However, "very very blurry" is really a vague term. The most effective setting, is the Global max texture size slider, that should be at Max, and the MipMap setting, that should be at least at 5, or even more. And, your video card setting should use Anisotropic filtering, at least at 8x.