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   81503
   The Galactic Ridge X-ray emission means an unresolved excess of X-ray
   emission extended along the Galactic plane. It has been known since the
   early stage of X-ray astronomy, however the origin still remains
   unknown. Even though the Astro-E and AXAF are launched, ASCA still has
   an advantage of the large effective area for high energy X-ray band in
   the large field of view. ASCA deep observation of the Galactic Ridge
   has not been performed yet. It give an opportunity to reveal the small
   spatial structure of the Galactic Ridge X-ray emission and the origin
   which has been a mystery for about twenty years.
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