Abstract: This paper theoretically analyzed main factors of tensile strength of liquid-crystal po-lymer (LCP) extruded single-core fiber cable with the diameter of 0.5 mm during the forming process. The factors mainly contained temperature feature of the melted LCP, structure parameters of mold core and die sleeve, space between die sleeve and mold core, and tension stringing and traction speed of optical fiber. Results show linear relationship between tensile strength and strengthened story thickness of small-diameter LCP is not ideal. The liquid-crystal polymer extruded fiber cable has maximum tensile strength within a certain diameter.