  Using Chandra X-ray, Spitzer mid-IR, and 1.5 GHz radio data, we examine the
spatial structure of SNR 3C391. The X-ray surface brightness is generally
anti-correlative with the IR and radio brightness. The multiband data clearly
exhibit a heart-shaped morphology and show the multi-shell structure of the
remnant. A thin brace-like shell on the south detected at 24 um is projected
outside the radio border and confines the southern faint X-ray emission. The
leading 24 um knot on the SE boundary appears to be partly surrounded by soft
X-ray emitting gas. The mid-IR emission is dominated by the contribution of the
shocked dust grains, which may have been partly destroyed by sputtering.
