This processing line adopts potato starch, corn starch as main material to produce a variety of twice extrusion food in different shapes which are popular in the market, such as crisp pea, shell, screw, square tube, round tube, wave etc. This process line is characterized by unique techniques, rational configuration, high automation and stable performance. It can finish steaming, extruding and shaping in one step without a boiler. The products look like true and taste crisp and delicious after frying.