Abstract: Lithology is an important internal factor controlling the development of metamorphic reservoirs in Archean buried hill. To clarify the lithologic development regularity and genetic mechanism of metamorphic rock in the Archean buried hill of Bozhong sag, this paper carries out mineral determination, identification of lithology logging response, comparison of connected wells and characterization of metamorphic rock distribution in Bozhong19-6 structural area, which are further compared with the Archean metamorphic rocks in Anziling area on the northern margin of Bohai Bay Basin. The results indicate that the types, formation time, and distribution patterns of metamorphic rocks in Bozhong19-6 structural area are similar to those in Anziling area. To be specific, the early Archean trondhjemite, tonalite and granodiorite (TTG) lithological assemblage underwent different migmatitization to form migmatitic granite, migmatitic gneiss, and gneiss. These metamorphic rocks are regularly distributed in a ring-like pattern, and the migmatitization gradually decreases from inner to outside. It is believed that the Archean metamorphic rocks in the Bozhong19-6 structural area originated from the TTG formed by deep melting of the basic crust under the background of mantle plume at about 2.5 Ga ago. TTG further underwent extensive migmatitization to form regularly distributed migmatite and dome structure, and experienced multiple periods of strong tectonic activities such as Indosinian, Yanshan and Himalayan in the later period, finally forming the current lithologic distribution pattern. Migmatitic granite is more prone to fracture and form fractures under stress, which is favorable for reservoir formation.