NASICON sensors compare properties with manufacture method in order to improve $CO_2$ sensitivity and stability the sensing behaviors. Oxidation mixing method and Sol-gel method were compare analyze to characteristic in which each other sintered to $900^{circ}C;to;1100^{circ}C$ and NASICON $CO_2$ gas sensors were fabricate. Oxidation mixing method showed better sensing properties at sintered $1100^{circ}C$ result to NASICON electrolyte analyze with manufacture methods.