Twin-Screw Extruders (TSE) are widely used in the plastic industry, to achieve continuous compounding and high productivity. During the compounding, shear flow is generated mainly by screw elements of TSE. Shear flow is impossible to break-up the droplets above a viscosity ratio of 3.8, but extensional flow is possible from Grace experiment. We originally designed screw element which has small holes to generate extensional flow. As the materials, polypropylene (PP) and styrene-ethylene-butadiene-styrene block polymer (SEBS) were choose with high viscosity ratio. As a result of investigation using a self-designed evaluation equipment, we had found that extensional flow with high-pressure enables to break-up the SEBS of dispersed phase in PP matrix. Subsequently, the mixing experiment was conducted through TSE. The dispersion state was compared by different screw configuration between kneading and extensional type screw element. As a result, kneading element shows dispersion state was depended on specific energy. In the extensional flow type segment, we found that the dispersibility does not depend on the specific energy, and droplets are broken-up by volume flow rate while low-energy input. We newly found that use of extensional flow with high-pressure extrusion enables promotion of dispersion state with less energy than the kneading element.