Holocene eruptive products of the Tianchi volcano, Changbai Mountains, include dif ferent types of explogenetic clastic rocks（SiO2＝70%～73％，K2O+Na2O=10%~ 11%）of p antelleritic pumice,welded tuff and clastogenetic lava. Studies of mineralogy (r ockforming minerals and remnant minerals) , major elements,trace elements and S r and Nd isotopes of Holocene volcanic rocks suggest that volcanic rocks of Holo cene,c oneforming stage and shieldforming stage of the Tianchi volcano are comagmat ic pro ducts evolved from mantle sources. Holocene volcanic rocks have strong negative a nomalies of Eu, Ba, Sr, Ti, reflecting that the magma evolution is controlled by strong differentiation crystallization of plagioclase.