This process line uses potato starch, corn starch as main materials to produce a variety of twice extrusion food in different shapes which are popular in the market, such as crispy pea, shell, screw, square tube, round tube, wave, etc. This process line is characterized by unique technics, rational configuration, high automation and stable performance. It can finish steaming, extruding and shaping in one step without a boiler. The products have similar shapes to the real one and taste crispy and delicious after fried.