Abstract: Self lubricating composites consisting of Sn bronze fiber or powder as the matrix and MoS 2 and PTFE as the lubricants were prepared by powder metallurgy process. The mechanical properties and tribological behavior of the composites were investigated by taking into account the effect of porosity. The cross section morphologies of the composites were examined by means of metallography. As the results, Sn bronze fiber based composite shows much higher ultimate tensile strength and impact strength and better tribological behavior than Sn bronze powder based counterpart. This is attributed to more inter connected pores and honeycomb like structure of the fiber based composite, which is beneficial to the permeating, storage and transferring of MoS 2 and PTFE solid lubricants.