In order to study the characteristics of the combustion chamber outlet pressure and temperature at different equivalence ratios， adopting the rotating detonation combustor （RDC） model with multi-hole injection， acetylene as the fuel and air as the oxidizer， pressure and temperature distribution uniformity， pressure ratio， injection pressure ratio and so on are analyzed. The results show that keeping the mass flow rate constant， with the increase of the equivalent ratio， the combustion conditions of RDC gradually change from lean fuel to rich fuel， the uniformity of outlet pressure and temperature will first become better and then worse， and the pressure ratio first increases and then decreases. When the equivalent ratio value is 1， the combustion chamber is a double-wave propagation mode. And uniformity of the outlet pressure and temperature is the best， the minimum CV and 1-CU value is 0.57 and 0.52， the minimum distortion coefficient and OTDF value is 2.936 and 0.36， and the maximum pressure ratio value is 1.13. However， the equivalent ratio has a limited effect on the pressure ratio enhancement.