************************************************************************* 51016 During the Galactic Ridge Observation program of ASCA on Mar/1996, the existence of a bright extended X-ray halo was observed around young open cluster, NGC6383. The X-ray spectrum of diffuse component show quite high temperature above 4keV. Such a high temperature gas cannot be made by stellar wind of cluster members (OB stars). To search for the origin of this halo(temperature and abundances), we propose 40ks observation to get better statistics (4 times longer exposure). *************************************************************************