Method: Extract volatile oil from green, stir-baked with rice and bran Codonopsis pilosulaby by wet distillation method, and separate and identify them by GC-MS technique.

• 方法利用水蒸气蒸馏提取党参挥发油的方法，分别提取党参片、米炒党参、麸炒党参，利用GC-MS联用技术对挥发油成分进行分离鉴定。