Wash the glutinous rice, soak it in cold water for about 12 hours, take it out and drain it. After about 3 hours, it is ground into powder for use. Wash kidney beans, soak them in cold water for about 3 hours, cook them in a pot, take them out, wash candied dates, cut them into small grains, peel purple potatoes and cut them into small grains, wash raisins for later use, and mix glutinous rice flour, purple potatoes, raisins and candied dates evenly for later use. Sprinkle a layer of clean glutinous rice flour, cover it and steam it for a while, then sprinkle a layer of prepared glutinous rice flour, cover it and steam it for a while, cover it repeatedly, and finally sprinkle clean glutinous rice flour on the last layer, cover it and steam it for 30 minutes.