This book is about CFD analyse and aluminium profile extrusion. It shows the common problems in aluminium extrusion processes, problems with the tools, extrusion dies and most important. it shows the solutions to the problems. Using COMSOL Multiphysics the user can step by step find the solution for the problems, that happen most of the time like pressure, force, stress, load, vibrations, heat influence on the extrusion dies. In the first part of the book is shown the statistic of aluminium consumption in the last 15 years, theoretically explained are the parts of the extrusion press and types of tools that are used in extrusion. In the second part of the book is shown a numerical simulation of a real profile that has been produced in the German company HUECK. Tha parameters used in the simulation are the same as by the extruded profile, and the results after the simulation are almost the same as in real life.