Thermoelectric properties of (Pb_(0.7)Sn_(0.3))Te alloy, fabricated by mechanical alloying and hot pressing, were investigated with addition of Na₂Te up to 1.5 at% as acceptor dopant. A transition from p-type to n-type occurred at 425℃ for the undoped (Pb_(0.7)Sn_(0.3))Te. With doping Na₂ Te more than 0.1 at%, however, the hot-pressed (Pb_(0.7)Sn_(0.3))Te exhibited ptype conduction up to 450℃. Electrical resistivity of the hot-pressed (Pb_(0.7)Sn_(0.3)) Te increased by reduction treatment of the powders in hydrogen atmosphere before hot pressing, which was due to the fact that oxide layer on the powder surface was removed by reduction treatment. Figure-of-merit of the hot-pressed (Pb_(0.7)Sn_(0.3))Te was optimized to be 0.83×10^(-3)/K at 200℃ with doping 0.5 at% Na₂Te.