The flavoring compounds of fresh Iris rhizomes treated by biological technology were prepared with simultaneous distillation and extraction equipment(SDE).They were isolated and identified by capillary GC/MS method.69 volatile components were identified and determined,accounting for 84.24% of the total area of the peak.The relative contents of constituents were determined by area normalization method.The main flavoring compounds are:3-methyl-2-butenal(0.14%),(Z)-3-hexenal(0.09%),(Z)-2-heptenal(0.07%),(E)-2-...