The flat extrusion container can provide more favourable condition for metal flow in flat-wide profile extrusion, and the extrusion force is decreased. The successfully experiences of flat extrusion container application in 36 MN magnesium extrusion press indicate that optimization design for liner of flat extrusion container should be carried out,stress is decreased as much as possible, and processing quality is guaranteed to avoid processing stress. The material selection of flat extrusion container should ensure higher strength, good thermal fatigue property, thermal stability and processing performance. The heating tube hole should be reduced properly in jacket corresponding to the inner hole short side of flat extrusion container, thus it is beneficial to whole temperature uniform change of flat extrusion container. The temperature control and adjustment of flat extrusion container should be conducted to prevent plastic deformation initiated by overheating.