Show image quality as like original image after resize in as3.

How are you resizing? Normally, you would draw the original bitmap data into the new bitmap data, using a matrix to resize. To smooth scale, you need to use the smoothing option of the draw method. Here's a little sample that takes a library image and scales it to 500x500, using smoothing:

var orig:BitmapData = new baseMap(); //library image

var res:BitmapData = new BitmapData(500,500);

var m:Matrix = new Matrix();

m.scale(res.width / orig.width, res.height / orig.height);

res.draw(orig, m, null, null, null, true);

var c:Bitmap = new Bitmap(res);

addChild(c);

toggle the true to false in the draw, to see the difference...