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In this paper the electronic structure and the lattice dynamics of PbTe were investigated by using the density functional theory and the thermoelectric properties were then calculated within the semi-classical Boltzman theory.Moreover, the relationship between the thermoelectric properties and the electronic structure and the lattice dynamics was also be explored and some strategies were proposed in hoping to optimize the thermoelectric properties.Therefore, our theoretical calculations could give a valuable insight on how to enhance the thermoelectric properties of PbTe in further.