Abstract: Choosing proper pot to cook soup to reduce energy consumption and ensure high quality of soup is current concern of food scholars and people.Based on this，numerical simulation method was used to perform finite element analysis on the stew pot of purple sand and stainless steel.Fluid-solid coupling method was used to simulate flow field.It was analyzed in two sides of field distribution and energy efficiency.Characteristics of stewing process in pot with different material were discussed.Results showed that purple casserole had slow heating and stratification in velocity distribution，which was suitable for cooking for a long time of more than 105 minutes.Stainless-steel pot had a stable pressure distribution and ingredient in soup was easy to be heated.It was suitable for short cooking of less than 45 minutes to stew.When soup time was more than 2 hours，heating efficiency of purple clay pots was 19.09% higher than that of stainless-steel pots，which was more energy-saving.