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To explore the ignition and combustion characteristics of tetramethylammonium octadecahydro-eicosaborate ((Me4N)2 B20H18), the compound was obtained by the oxidation of decahydrodecaborate anion, and its combustion heat was measured using an oxybomb calorimeter, and a high-speed camera and infrared thermal imager were used to record the flame phenomenon and the surface temperature on the combustion process of the sample. In combination with the pyrolysis behaviors of the compound in nitrogen and air atmospheres, the combustion process of the (Me4, N)2, B20, H18 was evaluated. The results show that the actual density of the (Me4, N)2, B20 was measured at 0.96 g/cm³, and the (Me4, N)2, B20 exhibits high thermal stability, which decomposes at above 250°C in the nitrogen atmosphere. While in the air atmosphere, an evident mass increment was present at 300°C after a mass loss at 240 - 300 °C. The combustion heat of the (Me4, N)2, B20 is 55.5MJ/kg. This compound presents good ignition combustion performance, and it burns in air with a green characteristic flame. Its surface temperature can reach 1 100°C during the combustion process. [ABSTRACT FROM AUTHOR]