Wash 1 kg soybean and soak for 5-8 hours. Beat the soaked soybeans into soybean milk with a cooking machine, prepare a basin or pot, and filter the bean dregs with gauze. Put the filtered bean dregs into a big bowl. Boil the filtered soybean milk, and 1 kg soybean is poured into 8 pieces of water. Stir while boiling to prevent the bottom of the paste. After boiling, skim off the floating foam, and the soybean milk must be boiled to the boil. Turn off the fire and let it dry for 2 minutes. Prepare 50ml of white vinegar and dilute it with 250ml of clear water. Pour the diluted white vinegar into soybean milk several times, slowly stir it to form tofu pudding, and then press it with a box to make it.