In order to effectively capture the flame propagation rule in the annular combustor and clarify its ignition mechanism of joint flame, the whole ignition process of the combustor was recorded on the TurboCombo made by Zhejiang University with the help of a high-speed camera to carry out visual experimental research. This paper mainly introduced the research on ignition mechanism of three configurations(direct-injection annular combustor, swirling-injection annular combustor, and direct-injection annular combustor with turbine guide blades), and analyzed the characteristics of the process of flame propagation, the process of flame combination under the influence of circumferential velocity’s component because of the swirling injectors, the effect on circumferential ignition process ignition time due to the turbine guide blades. The results show that the high-speed visual measurement can track the whole ignition process in the annular combustion, which is helpful to clarify the ignition mechanism of flame joint in the annular combustion chamber. This study is helpful to the analysis of the high altitude ignition performance of APU and other aero-engines.