Black kerneled rice was used as raw material,based on the single factor experiment and Box-Behnken principles,the Design-Expert software was applied in the optimization of the puffing process. The result showed that surface regression equation was fitted very well. The optimal conditions were as follows:material particles 60 mesh,material moisture 26%,screw rotational speed 350 r/min,temperature178℃. In these conditions,the gelatinization degree was 85.62%. The mathematical model established was able to predict the gelatinization degree accurately.