To study the effects of extrusion system nozzle runner structural parameters （cone angle， outlet diameter， and molding section length） on the fluid flow of energy-containing material extrusion process in the direct-in-writing-forming （DIW） technology， an extrusion model of high-viscosity energy-containing materials based on the Polyflow Extrusion module was established， and was verified by extrusion experiments under the working conditions of direct-write 3D printing. The study analyzed the effects of cone angle range （90°-130°）， outlet diameter （0.75-2 mm）， and molding section length （5-20 mm） on the extrusion process of high-viscosity energy-containing materials through the established model. The results show that the Polyflow Extrusion module can accurately simulate the flow behavior of composite energy-containing materials. When the cone angle is 100°， and the nozzle outlet diameter is between 1.5 mm and 1.75 mm， the extrusion process is relatively stable with small extrusion expansion. Additionally， as the length of the molding section grows， the required inlet pressure increases while the outlet expansion effect decreases.