Ruddlesden-Popper (RP) phase (Sr 0.9 La 0.1 ) 3 Ti 2 O 7 /xAg (x = 0, 0.05, 0.10, 0.15) are systematically investigated with regard to their phase composition and thermoelectric transport properties. The XRD results show that all oxide samples are of two phases and they have layered microstructure. The electrical conductivity is found to be increased simultaneously. And the absolute Seebeck coefficient decreases firstly and then increases Ag addition, which leads to (Sr 0.9 La 0.1 ) 3 Ti 2 O 7 /xAg (x = 0.10) sample possesses optimum power factor. The total thermal conductivity lowers with Ag addition. The dimensionless figure of merit, ZT, reaches 0.12 for x = 0.10. These results suggest that a proper of metal element Ag addition would be an effective way improving thermoelectric performance of (Sr 0.9 La 0.1 ) 3 Ti 2 O 7 system.

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