The aluminum alloy extruded profiles used on large-scale radiators are mostly solid, which are characterized by large circumscribed circle size, complex cross-sectional shape, large difference in wall thickness, small heat dissipation tooth pitch and large cantilever. When the cross-sectional ratio and tongue ratio (cantilever length: tooth pitch = tongue ratio) of the same section and the diameter of the circumscribed circle of the profile exceed a certain range, it is difficult to make the metal flow uniform with flat die extrusion, and it is easy to damage the die. In order to solve the above problems, several molds with typical structures have been developed