A three factors quadratic regression rotation combination design was adopted to optimize the technical conditions of explosion puffing drying process for banana at variable temperature and pressure in the single factor's foundation.This paper analyzes the effect of puffing temperature,puffing pressure,vacuum drying temperature and the interaction of the three factors on color,crispness,and the effect of hardness and water content.Based on the experimental data,the quadratic regression model of four indexes was deduced,then variables were analyzed with response surface methodology(RSM).The weights of four evaluation indexes was determined by factor analysis.Through comprehensive evaluation,the range of the optimal technical conditions of explosion puffing drying for banana at variable temperature and pressure difference was obtained.The result indicated the four indexes were affected significantly by the puffing temperature and vacuum drying temperature,and the interactions of the three factors did not affect the product obviously.The optimal technical conditions were as follows: puffing temperature 86-91℃,puffing pressure 0.16-0.24 MPa,vacuum temperature 83-87℃.