Abstract: The K-Ar dating results of basahs in eastern Liaoning Province indicate that Qujiatun and Luanshishanzi basahs were formed in the Late Cretaceous with an age of 81．58 4±2．46 Ma and in the Paleogene with an age of 58．36±1．64 Ma，respectively．Abundant deep-derived xenocrysts such as olivine，clinopyroxene，and hornblende have been found in the basalts．The olivine xenocrysts from Luanshishanzi basalt have higher Mg# values (79．5-88．5，ave．84)than those from Qujiatun basalt(77．0-79．8，ave．78．4)．The clinopyroxene in basalts is diopside，whose change trend in Mg# etc．from nuclear part to periphery is similar to that of olivine．The orthopyroxene in basalts is bronzite with the Mg# values of 85．2～87．6(ave．86．4)．The circle cracks，kink bands，compositionzoning，and equilibrium of Mg# values between olivine xenocrysts and host basahs imply that the xenocrysts could be the earlier magmatic cumulate caught by the host basaltic magmas．The petrological and geochemical data of the basalts show that(1)they are alkaline basalts，but the Qujiatun basalts are higher in CaO and A12O3，lower in SiO2 and MgO than the Luanshishanzi basalts (2)they have similar REE distribution patterns，but the Qujiatun basahs have higher REE abundances and LREE／HREE ratios than the Luanshishanzi basalts；(3)they have similar Sr-Nd isotopic compositions．The Isr and εNd(t)values are 0．7039～0．7045 and+1．60～+3．69，respectively．It implies that they could be derived from the depleted lithospheric mantle．