The aid of the combination design of quadratic orthogonal rotation was adopted to analyze the effects of barrel temperature, material moisture, screw speed, L-a-PC addition on breakdown value of restructuring rice, and the quadratic regression model of rice breakdown characteristics was deduced. Then a response surface method was employed to obtain the effect order of four factors on the yield of restructuring rice: barrel temperature, L-a-PC addition, screw speed and material moisture. Through frequency excellent-choosing, the optimization breakdown parameter range respectively was: barrel temperature of 71.1～75.5℃, moisture of material of 29.2%～30.5%, rotation speed of extruder of 185～208 r/min, L-a-PC addition of 0.44%～0.55%. The restructuring rice that obtained under these conditions, after repeated experimental verification, the average of value of breakdown of restructuring rice was 1221 cp, to meet feature requests that the general breakdown of rice to cooking rice (more than 1200 cp). 