MIRIS (Multi-purpose Infrared Imaging System) is the primary payload on the Korean science and technology satellite, STSAT-3, which was launched on 2013 November 21. It is designed to observe the near-infrared sky with a $3.67^{circ}{ imes}3.67^{circ}$ field of view and a $51.6^{{prime}{prime}}{ imes}51.6^{{prime}{prime}}$ pixel resolution. Using two narrow-band filters at $1.88{mu}m$ (Pa ${alpha}$ line) and $1.84+1.92{mu}m$ (Pa ${alpha}$ dual continuum), the Paschen ${alpha}$ Galactic plane survey has been carrying out, and the area for the Galactic longitude from $+280^{circ}$ to $+100^{circ}$ (with the width of $-3^{circ}$ < b < $+3^{circ}$) has been covered by 2014 August 31. In this contribution, we present the preliminary results of the MIRIS Paschen ${alpha}$ emission maps and compare them with other wavelength maps such as $H{alpha}$ and dust maps. Many of the Paschen ${alpha}$ features have been detected along the plane, and some of them are weak or invisible in the $H{alpha}$ map and coincide well with dense cloud regions.