1, cooking time: old-flame soup usually requires a longer cooking time to fully extract the nutrients and flavors of the ingredients. Stewed soups may have a relatively shorter cooking time, but still require some time to simmer.

2, fire control: old-flame soup in the cooking process usually use the fire slowly simmering, in order to maintain the clarity of the soup and the integrity of the ingredients. Stewed soup may be based on different ingredients and flavors, using different fire, such as the first large fire to boil and then turn small fire stew.

3, flavor characteristics: old fire soup is characterized by its rich soup base and the essence of the ingredients, mellow flavor. Stew, on the other hand, may focus more on the original flavor of the ingredients and the refreshing taste of the soup.

4, the choice of ingredients: the old fire soup is usually used with nourishing effect of ingredients, such as herbs, meat and bones. The choice of ingredients for stew is more diverse, and can be flexibly combined according to personal preferences and seasonal changes.