Abstract: The lithological characteristic is complicated and the li thologic division is fairly difficult in archaeozoic era base rock.In the research,the author found out the response feature of different lithological logging curve based on the core name,extracted base rock inside lithogical sensitive density,neutron,gamma and photoelectric absorption coefficient as input terminal to construct BP neural network to identify archaeozoic era lithology.The result comparing core test data shows BP network lithology identification is reliable.The research enrich archaeozoic era lithology method and establish a method foundation for further study.