Bicomponent fibers in the type of sheath-core and side-by-side from nylon 6 and carbon black(CB) filled nylon 6 have been spun in order to investigate their electrical conduction mechanisms and mechanical properties. As the concentration of CB increases, the system shoves a sharp decrease of electrical resistivity at the critical CB concentration at room temperature. At the critical concentration, the resistivity also increases significantly as the draw ratio increases. The conductivity of side-by-side fibers has been found to be higher than that of sheath-core fibers. From the temperature dependence of conductivity of the bicomponent fibers, it may be concluded that the resistivity of the bicomponenl fibers is influenced mostly by thermal shrinkage and thermal expansion. The tenacity anal elongation at break of the bicomponent fibers decreases wish the increase of CB concentration but the tensile modulus is not dependent on the CB concentration. The tenacity and elongation at break of sheath-core fibers are greater than those of side-by-side fibers.