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The Kaimanovich-Vershik entropy is an important tool in the Martin boundary theory to characterize the triviality of bounded harmonic functions. The purpose of this talk is to present some recent results in the study of the Kaimanovich-Vershik entropy on complete co-compact Riemannian manifolds. As its application, we derive some splitting theorems on Riemannian manifolds with weighted measure. This talk is based on joint work with Siqi Jian and Yu-Zhao Wang.