$SmCoO_3$ system was investigated for their application to themoelectric materials. All specimens showed p-type semiconducting behavior and their electrical conductivity ($sigma$), Seebeck coefficient (S) and power factor were measured at high temperature. And the effect of dopant ions on their thermoelectrical properties were also investigated. $Fe^{3+}$ ion doped into $Co^{3+}$ site enhanced the Seebeck coefficient and decreased the electrical conductivity simultaneously. The maximum Seebeck coefficient value for 60% doping case reached to 780 ${mu}V$/K at $240^{circ}C$. However $Fe^{3+}$ doped system cause an negative effect on power factor value. In case of the pure phase, the maximum Seebeck coefficient value reached to 290 ${mu}V$/K at $240^{circ}C$ and the maximum electrical conductivity was obtained 748 1/(ohm$ imes$cm) at $960^{circ}C$. As a result, the maximum power factor was obtained $1.49 imes10^{-4}$ W/$mK^2$ at $550^{circ}C$.