An N-type lead telluride (PbTe_0.95) thermoelectric material prepared by a conventional sintering method (CSM) has been investigated for the first time. N-type nanosized lead sulfide (PbS) fabricated using the one-pot synthesis method was embedded in the PbTe_0.95 matrix to enhance the thermoelectric efficiency, zT. It was successfully demonstrated that the CSM could be used to prepare the nanosized n-type PbTe composite with the zT value of ∼1 at 673 K. This value is comparable to the one synthesized using spark plasma sintering and hot press sintering methods. We attribute the enhanced zT to the strong phonon scattering induced by the nanosized PbS. Meanwhile, the nanosized PbS particles, acting as a sintering additive, enhanced the sintering behavior of as-prepared PbTe_0.95 powder. It was found that the introduction of 3 wt% nanosized n-type PbS could reduce the lattice thermal conductivity of the pristine sample of PbTe_0.95 from 0.914 W m⁻¹ K⁻¹ to 0.59 W m⁻¹ K⁻¹. Finally, a single parabolic band model (SPB) demonstrated that the 3 wt% was the optimized doping amount for the PbS-doped PbTe_0.95 composites.