The effect of different combustion conditions on combustion characteristics of (AVC) with a slot in rear blunt body was numerically calculated. The results show that it can achieve stable combustion with different conditions. As incoming velocity increases, the total pressure loss increases, the combustion efficiency reduces, the temperature in cavity increases and the temperature distribution in cavity becomes more uniform. With the increase of incoming temperature, the total pressure loss firstly reduces then remains constant, the combustion efficiency increases. As wall temperature increases, the temperature in cavity increases and the temperature distribution in cavity becomes more uniform, the total pressure loss increases, the combustion efficiency reduces. As equivalent ratio increases, the total pressure loss firstly increases then reduces, the combustion efficiency reduces.