Abstract:The silkworm pupa was used as the material. The effects of pressure difference，stagnation time，evacuation time，and puffing temperature on the water content，color，and brittleness of silkworm pupa were investigated during variable temperature and pressure differential puffing drying. Through single factor test and orthogonal test，and their reliability verification，the optimal process parameters of explosion puffing drying process for silkworm pupa at variable temperatures and pressure difference were determined as pressure difference 0.2 MPa，stagnation time 10 min，evacuation time 2 h，puffing temperature 80 ℃.Under this optimal technological condition，the explosion puffing drying at variable temperatures and pressure difference the brightness L*was 65.49，the water content was 2.95%，and the brittleness value was 156.28 g/s