It is described the effect of many various factors on the extrusion pressure of pure aluminium by direct method as the same in the previous report. The results obtained are as follows:(1) Although the accurate measuring of min extrusion. pressure is difficult owing to hot working, max. pressure changes in the same tendency as in Pb and Sn by reduction ratio.(2) At the constant reduction ratio, max. pressures in circle die are the largest of all other die hole form, and the smallest is in triangle die.(3) Die angle which gives the smallest pressure is about 75° and the bearing length increases proportionally the max. pressure.(4) At the constant reduction ratio, two side ratio, in rectangle die which gives the smallest extrusion pressure is 1.(5) It is remarkably affected by the follower plate forms and temperatures as is Fig. 8, 9 and 10.(6) The billet length increases the max. pressure proportionally, but min. one is constant as in the case of Pb.