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1RXS J232953.9+062814 was identified as a cataclysmic variable by Wei et al.(1999). Four low-resolution spectra of 1RXS J232953.9+062814 were obtained byusing the 2.16-m telescope of the National Astronomical Observatories, in whichtwo of them were at outburst, and the other two were at quiescence. The systemis about 16.8 B and 16.5 V at quiescence, and 12.6 B and 12.6 V at outburst.The quiescent spectra were dominated by double-peaked Balmer emissions, whichindicates a hydrogen-rich system with a high-inclination accretion disc. MgHand TiO absorption bands appeared in the quiescent spectrum imply a companionwith a spectral type of early M dwarf. If we take it as a M0 dwarf, the systemis located at a distance of 350 pc with a proper motion velocity 150 kms$^{-1}$. The superhump period of 0.046311 days (Uemura et al. 2001) wasconfirmed by our V photometry. The short period and the hydrogen-rich naturereveal that this system is another SU Ursae Majoris-type dwarf nova below theperiod minimum after V485 Centauri. 1RXS J232953.9+062814 is one of the mostimportant systems for studying the evolutionary scenario of cataclysmicvariables since it is much brighter than V485 Cen.Comment: 4 pages, 2 figures, accepted by Chin. J. Astron. Astrophy

1RXS J232953.9+062814: a New SU UMa Dwarf Nova below the Period Minimum