The purpose of baking sweet potatoes in air fryer is to prevent water vapor from staying in the fryer, thus affecting the taste and cooking effect of food. Water vapor tends to make food moist and affect its crispness or flavor. Steam can also easily reduce the temperature in the frying pan, making food cooking uneven. Roasting sweet potatoes at the bottom of the air fryer can ensure that the hot air flow in the fryer is not hindered, and it is easier to make the food reach the ideal cooking state.