A low-gluten flour with a powder plug strained, the melted butter and milk stirred well, the second step, the egg mixture with sugar and water syrup, placed in a basin over warm water to whip, the third step, sift the flour into the batter mixing, from the position of the two o'clock through the shed, the middle of the roughly to the position of the eight o'clock, from nine o'clock position to flip out, the left hand counterclockwise turn the basin turned to no dry powder, after holding some batter poured butter milk liquid, and then the Liquid along the spatula poured back into the egg mixture, the last step, with the same method to do about 100, into the preheated, 160 degrees oven bake for 50 minutes can be taken out to eat sponge cake is ready