Nostoc flagelliforme and oyster sauce soup is a traditional famous dish of Han nationality in Guangdong, belonging to Cantonese cuisine. Strengthening the spleen and nourishing the kidney, clearing away deficiency and heat. Soak Nostoc flagelliforme until soft, rub it with a few drops of raw oil and wash it. Wash oyster sauce (soaked in water), wash pork and cut into pieces, and wash plum beans. Put the oyster sauce, pork gizzard and plum beans into the pot together, add appropriate amount of water, boil with strong fire, simmer for 1 hour, add the seaweed and then simmer for 1 hour, and season for use.