Abstract: In recent years, portable electronic devices with wearable and flexible functions have attracted much attention, and research on their energy storage devices has gradually become a hot topic.Planar supercapacitors have the advantages of high power density, fast charging/discharging rates, good cycling stability, and easy integration, making them a potential power source for wearable and flexible electronic devices.Among the electrode materials, zinc manganate (ZnMn₂O₄) has a higher theoretical specific capacitance, but along with poor conductivity, which impede its long-term stability and power density.Carbon nanotubes (CNTs) have excellent long-term stability and high power density, as well as good conductivity.Therefore, the conductivity of ZnMn₂O₄ based electrode can be improved by the introduction of CNTs.Microelectronic printing technology is a new and convenient method for preparing planar supercapacitors.In this paper, ZnMn₂ O₄-CNT composite was prepared by hydrothermal method, and then ZnMn₂O₄-CNTs based planar supercapacitor was prepared on polyethylene terephthalate substrate by using the dispensing printing function of microelectronic printer.Electrochemical performance evaluation reveals that the ZnMn₂ O₄-CNTs based planar supercapacitor exihibts better conductivity and enhanced electrochemical performance in compare with the ZnMn₂O₄.one.The ZnMn₂O₄-CNTs based planar supercapacitor cah deliver a high specific areal capacitance of 13.687 mF cm^-2 at the current density of 0.023 mA cm^-2, and a capacitance retention capability of 99.47% after 10000 cycles, which is much better than the electrochemical performance of pure ZnMn₂O₄ based planar supercapacitor.