Abstract: Accurate judgment and division of strata are difficult due to the tiny and mixed geothermal drilling cuttings. According to the lithologic assemblage and marking characteristics of Qingbaikouan stratotype profile in Tianjin region, the paper discusses the relevant technical methods of cutting logging and drilling-time logging. The characteristics of drilling time curves and logging curves of Qingbaikou System are summarized by studying the corresponding relationships between lithology and drilling time, as well as lithology and electrical property. The stratigraphic boundaries of each formation of Qingbaikou System can be accurately defined on the basis of regional stratigraphic characteristics, cutting logging and drilling-time logging data, combined with the geophysical logging curves.