The callus was induced from the seedlings of Schizonepeta tenuifolia Brig. (Labiatae) and the effects of culturing conditions on growth rate and essential oil formation of the callus were experimented. It was found in the experiments, that the proper culturing temperature is $23^{circ}C$ and the addition of biosynthetic precursors(leucine, mevalonic acid lactone) inhibits the growth of the callus. The growth rate of the callus and the amount of essential oils of the callus in the medium containing NAA were higher than the medium containing 2,4-D. The essential oils from the callus and the leaves of the cultivated Schizonepeta tenuifolia showed different GC pattern, but pulegone was found in both oils.