By feeding to the extruder, the high temperature will skin the hose, the use of microwave radiation will be heated from the inside to the outside of the hose, at this time a large number of microwave so that the internal temperature of the rubber material is rapidly warmed up, and triggered by the decomposition of the foaming agent will be the foam hose; through the hot air will be vulcanization of the rubber material, and finally the hose into the cooling tank for water-cooled, in accordance with the size of the shear into the required length, and made into a finished product.