We have developed a new type of proportional counter utilizing a capillary plate with the capability of fine imaging power. Light outputs of the CGPC (Capillary Gas Proportional Counter) due to gas proportional scintillation are investigated by an optical imaging apparatus featured an intensified CCD camera to the CGPC. We successfully detected a image of alpha-particle track with a fill gas of xenon+5%methane. It indicates first evidence of the gas multiplication in a thin capillary. We discribe in detail the light output of the CGPC and characteristics of the imaging due to the CGPC.