Backward extrusion is a suitable method for forming thin-walled cup-shaped details. However, the deformation force is very large, making it difficult to choose equipment and ensure the durability of the die. The continuous extrusion method is improved from the traditional backward extrusion method to overcome the main disadvantages in the deformation process. The die structure in continuous extrusion is improved, including three main parts: fixed punch, primary punch and die. The use of a smaller size original workpiece that is deformed in the fixed punch and flows into the die cavity is the cause of the significant reduction in the deformation force. The result obtained is that the deform of the workpiece is uniform and 200% larger according to the product height, and the deformation force is reduced by less than ¼ compared to the traditional backward extrusion method. Therefore, continuous extrusion method is highly applicable in the production of products in industry and national defense.