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The relationship between the self-organization of double vortices(SODVs)and the formation of typhoons was discussed based on six numerical experiments with the Fifth-Generation National Center for Atmospheric Research/Penn State Mesoscale Model(MM5)and further discussion was made with a real typhoon case.The results showed that there is a critical distance dc for SODVs in baroclinic atmosphere.When the distance between separated vortices is smaller than or equal to dc,the double vortices self-organize into a typhoon-like vortex with two spiral bands.But the double vortices cannot have such organization if the distance between them is larger than dc.The value of dc is about 380 km in the context of ideal conditions in this paper,larger than that achieved in a barotropic model.A typical typhoon case in2005(Haitang)was selected to verify the above-mentioned conclusions.It was found that the SODV is one of the important and typical ways for the formation of typhoons.