The experimental result of the quantitative determination of magnolol in Cortex Magnoliae Officinalis and its processed samples by HPLC has shown that the stir-fried sample has the highest content of magnolol among all sample and so does the ginger-fried sample among all ginger-processed samples. As a condiment, ginger can increase the content of magnolol to a certain extent, but the quantity used in processing does not affect the content significantly.