Abstract: Zibo Stone is a type of typical limestone ornamental stone lying in Ordovician Majiagou Group, characterized by clear texure. Zibo Stone has a long history and rich cultural connotation. Based on field survey, thin section identification, geochemistry analysis, its paleosedimentary environment and genesis are studied. The results show that the main lithologies of Zibo Stone are micrite and grainstone. The average content of ∑（MgO+CaO+LOI） is 97.47%. SiO₂, Al₂O₃ and other major elements representatives of terrigenous component have low contents. The total content of rare earth elements is low, and light rare earth elements are enriched, with slightly negatice Ce anomalies and positive Eu anomalies. The distribution characteristics of REE are consistent, indicating that the sedimentary environment remained relatively stable. The study of paleoclimate, paleosaltitude, paleooxygen phase, and paleowater temperature based on the geochemical discriminant indicators and the petrological characteristics indicate Zibo Stone is formed in the arid and hot paleoclimate, and in the epicontinental sedimentary environment of the southern hemisphere low-latitude zone with weak oxidation-weak reduction and reduction environment. This study provides a scientific basis for the protection and utilization of Zibo Stone resources.