The Cenoioic volcanic rocks in Changbai Mountains consistof basalts, trachytes and alkali rhyolites. A lotof enclaves named spinet lheriolite and pyroxenite derived from the mantle were fount In alkali basah.of Miocene Naitoushan period. The main minerals in mantle enclaves and volcanic rocks of different periods are olivine clinopyroxene, enstenite, spinel, plagioclase and alkali feldspar. the species and chemical compositions of minerals from different rocks are different, reflecting the trend of magmatic differentiation evolution. The geothermobaro-meter of minerals indicates that the basaltic mama derived from the mantle at the depth of more than 82 km formed the deep mama chamber in the upper mantle at the depth of SSkm to 65km. Laser Raman spectrum analysis of inclusions in minerals from different volcanic rocks show that magma in great depth comained a lotof volatiles, and that strong exsolution occurred during the upward migration of magma. Besides, mantle volatiles decreased and crust volatiles increased in upward direction and underground water might have played an important role in volcanic eruption.