Abstract: The influence of drawing on the morphological and rheological property of polymer fluid system near the die exit during extrusion was studied. Numerical simulation of micro-tube extrusion was carried out using software POLYFLOW for analyzing the pressure field, velocity field，the extrusion swelling，and the change of boundary position. The study also showed that as the drawing velocity increased, the inlet pressure extrudate was affected significantly, however，the little affected. reduced，the shape of cross-section of the

Key words: drawing velocity, micro-extrusion；extrusion swelling, numerical analysis