A series of optical experiments were conducted to investigate the effect of flow filed on the flame ignition and propagation process between adjacent domes in triple-dome combustor. Results show that the initial fire core is formed mainly at the boundary of the recirculation zone， and the ignition process is staged. Initial flame core develops in the direction of local flow and it starts to propagate into other regions with the increase of combustion intensity. Under the same total pressure loss， the combustor’s circumference ignition time increases when the equivalence ratio decreases， especially in the time of the initial flame development. As the equivalence ratio decreases from 0.89 to 0.6， the circumference ignition time increases from 33.5 ms to 42 ms. During the circumferential ignition flame propagation， the coefficients of flow-induced acceleration increases with the decrease of equivalent ratio. When the equivalent ratio decreases from 0.89 to 0.6， the coefficients of flow-induced acceleration increases from 1.75 to 3.77， which means the turbulent wrinkle and other flow factors accelerate the flame propagation； in the initial flame development stage， the thermal expansion of gas dominates the flame propagation acceleration effect.