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Yttrium-filled skuttdites YyFex Co4-x Sb12 ( y= 0-0.40) were syrthesized. The effect of Y filling fraction on thermoelectric properties of YyFexCo4-xSb12 was investigated. All samples showed p-type conduct. The electrical conductivity decreased with increasing filling fraction y . The Seebeck coefficient increased with increasing temperature. The lattice thermal conductivity decreased with increasing filling fraction y and showed the minimum value at a certain filling fraction y = 0.3. The effect of different filling atoms M( M: Ba, Ce, Y) on the lattice thermal conductivity of MyFex Co4- x Sb12 was discussed. The maximum ZT value of 0.7 was obtained for Y0.08 Fe0.7 Co3.3 Sb12 at 750 K.