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Waves in a two-layer fluid are viewed as one of the simplest model of internal waves.In this paper, we investigate the interfacial waves in a two-layer fluid system of finite depth by usingan analytical approach named Homotopy Analysis Method (HAM). On the basis of convergent seriessolution of fully nonlinear interfacial periodic wave, phase velocity and wave slope are given withhigh accuracy, respectively, and the effects of the water depth ratio and densities on the interfacialwave properties are discussed.