Layer cake is one of sponge cake, cake batter is deposit on the steel band of tunnel oven or flat baking tray, after baking, we can get a layer of cake sheet with endless length or with one tray length. Then we cut the cake into lines, and depositing the cream, marmalade or jam on cakes that don't stand next to each other, then through one time folding, and we can get sandwiched layer cake.