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As the ignition and flame stabilization of gas generator fueled with air and kerosene is difficult,flame holder is needed.The influence of V-gutter flame holder on the flame stability is investigated by fixing the V-gutter with different blockage ratio at different position in the gas generator.Simulation results show that the flame stability of V-gutter with big blockage ratio is better.But the working and life time of the gas generator is limited as the pressure and temperature of the combustion chamber is higher.There exists an optimum fix position of V-gutter in the gas generator,making the flame stability and combustion efficiency better.And the uniformity of the flow field at the exit of the gas generator is also better.