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We present an X-ray analysis on the Galactic supernova remnant (SNR)G298.6-0.0 with Suzaku. The X-ray image shows a center-filled structure insidethe radio shell, implying this SNR is categorized as a mixed-morphology (MM)SNR. The spectrum is well reproduced by a single temperature plasma model inionization equilibrium, with a temperature of 0.78 (0.70-0.87) keV. The totalplasma mass of 30 solar mass indicates that the plasma has interstellar mediumorigin. The association with a GeV gamma-ray source 3FGL J1214.0-6236 on theshell of the SNR is discussed, in comparison with other MM SNRs with GeVgamma-ray associations. It is found that the flux ratio betweenabsorption-corrected thermal X-rays and GeV gamma-rays decreases as the MM SNRsevolve to larger physical sizes. The absorption-corrected X-ray flux ofG298.6-0.0 and the GeV gamma-ray flux of 3FGL J1214.0-6236 closely follow thistrend, implying that 3FGL J1214.0-6236 is likely to be the GeV counterpart ofG298.6-0.0.

New Identification of the Mixed-Morphology Supernova Remnant G298.6-0.0 with Possible Gamma-ray Association