Abstract: In recent years, the demand for energy storage equipment gradually increases, and supercapacitors are favored by researchers because of their excellent performances. Two dimensional transition MXenes are two-dimensional sheet materials similar to graphene, which have unique structure and rich functional groups. Ti₃C₂T_X MXenes have the advantages of good conductivity, high specific area and high specific capacitance, and can be widely used as excellent electrode materials for supercapacitors. However, Ti₃C₂T_X materials have the problems of easy oxidation and self-stacking, and needs to be modified and optimized as electrode materials. This paper mainly introduces the preparation methods of Ti₃C₂T_X materials, such as HF etching, fluoride etching, alkali etching and electrochemical etching, as well as the research methods of performance modification of Ti₃C₂T_X in the application process of supercapacitors, including the construction of Ti₃C₂T_X porous structure, surface modification and preparation of Ti₃C₂T_X composite electrode. The future progress trend of Ti₃C₂T_X supercapacitors is also prospected.