Birthday party is a regular activity in modern lifestyle. A birthday cake is often essential. However, the current manner of packing of is not extremely environmentally friendly. Cake boxes are discarded after usage. And another disposable paper plates must be prepared for eating cake. This is a waste of materials, and increases the difficulty of the waste disposal. Protection of natural resources and environment is everyone's duty. So I designed a "zero remaining" cake box, it is a novel, environmentally friendly cake packaging design. By simple design processing, the cake box can be easily turned into several plates. Then we can enjoy cake conveniently and environmentally friendly.