Borate deposits in eastern Liaoning Province are controlled by the horizons of the Lieryu Formation of the Liaohe Group and occur in layering or layer-like forms. Their generation is associated with original volcanism and sedimentation, multi-period metamorphism and deformation, superimposition and reformation of hydrothermal solution, as well as tectono-magmatism during the Indosinian-Yanshanian. The ore-forming elements were primarily originated from the volcanic-sedimentary systems. Pulsatory metamorphic-hydrothermal activities are assumed to be the main driving force for the formation of the hydrothermal system for the ore-forming process.