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We present the narrow-band and the equivalent width (EW) images of thethermal composite supernova remnant (SNR) 3C391 for the X-ray emission lines ofelements Mg, Si, & S using the Chandra ACIS Observational data. These EW imagesreveal the spatial distribution of the emission of the metal species Mg, Si, &S in the remnant. They have clumpy structure similar to that seen from thebroadband diffuse emission, suggesting that they are largely of interstellarorigin. We find an interesting finger-like feature protruding outside thesouthwestern radio border of the remnant, which is somewhat similar to thejet-like Si structure found in the famous SNR Cas A. This feature may possiblybe the debris of the jet of ejecta which implies an asymmetrical supernovaexplosion of a massive progenitor star.Comment: 9 pages, 4 embedded figures, Chinese Journal of Astronomy and  Astrophysics (ChJAA), in pres

A Narrow Band Chandra X-ray Analysis of SNR 3C 391