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   51069
   Cygnus X-3 exhibits a ''High State'' and a ''Low State''. The two
   states are differ widely in the continuum spectra and in the properties
   of iron line. The previous ASCA observations were taken only in its
   ''High State'', and revealed emission lines from various elements and
   emission-line-like feature produced by free-bound transition for S XVI.
   The plasma producing these spectral features is influenced by the
   luminosity and energy spectrum of a central source and plasma density.
   To understand two different intensity state transition, it is important
   to study the relations between a central source and the surrounding
   plasma. This study is enabled by sperior energy resolution of ASCA.
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