The extrusion ratio is one of the key parameters for manufacturing the lead-glass fiber(Pb-GF)composite wire by coating extrusion.The effect of extrusion ratio on coating extrusion of Pb-GF composite wire was studied by finite element numerical simulation with the use of the DEFOEM simulation software.The simulation result shows that the higher the extrusion ratio,the higher the effective stress that the glass fiber bears during extrusion.It is also observed that the extrusion force increases with the increase of the extrusion ratio.The extrusion experiment of Pb-GF composite wire reveals that extrusion ratio is changed by changing the quantity of glass fiber and composite diameter.The rule that increasing the extrusion ratio enhances the coating speed limit suggests that the load on the glass fiber increases with increasing extrusion ratio.Both the simulation and the extrusion experiments show that the extrusion force increases with increasing extrusion ratio. The extrusion ratio is one of the key parameters for manufacturing the lead-glass fiber (Pb-GF) composite wire by coating extrusion. The effect of extrusion ratio on coating extrusion of Pb-GF composite wire was studied by finite element numerical simulation with the use of the DEFOEM simulation software. The simulation result shows that the higher the extrusion ratio, the higher the effective stress that the glass fiber bears during extrusion. It is also also observed that the extrusion force increases with the increase of the extrusion ratio. The. experiment of Pb-GF composite wire reveals that extrusion ratio is changed by changing the quantity the glass fiber and composite diameter.The rule that increasing the extrusion ratio enhances the coating speed limit suggests that the load on the glass fiber increases with increasing extrusion ratio. Both the simulation and the extrusion experiments show that the extrusion force increases with increasing extrusion ratio.