For four daily ignition modes

including electric spark

hot wall suddenly touched

hot resource direct heated and hot wall continuous heated

a comparative analysis of the whole process of gasoline-air deflagration in confined space was made through visualization experiment and data analysis. There were great differences in ignition condition

combustion speed

flame structure and flame color for gasoline-air deflagration under different ignition mode. Although there were four stages during the process of gasoline-air deflagration in confined space

their duration time and flame color were all different. According to analysis for maximum explosion overpressure and explosion pressure curves

the ignition modes of maximum explosion overpressure from big to small were hot wall suddenly touched

electric spark

hot resource direct heated and hot wall continuous heated. At the same time the typical features of overpressure curve was analyzed.