Abstract: With <i<n</i<-alkane of vapor-liquid two-phase mists (<i<n</i<-hexane/<i<n</i<-heptane/<i<n</i<-octane/<i<n</i<-decane) as the research object, the minimum ignition energy of <i<n</i<-alkane mists was studied. By our self-developed measurement system, the concentrations and SMD of <i<n</i<-alkane mists were measured, and the results of the minimum ignition energy in 20 L explosion parameter measuring system were obtained. The results show that the minimum ignition energy of <i<n</i<-alkanes was greater than that of the corresponding pure gas phase <i<n</i<-alkanes; with the increase of particle size, the minimum ignition energy of <i<n</i<-alkanes increased exponentially, and the minimum ignition energy of <i<n</i<-alkanes increased by two orders of magnitude in the range of 0~40 <i<μ</i<m.