Air Fryer and Control Method and Stepless Speed Control Method therefor

An air fryer includes an air frying chamber for receiving a food therein, an air circulation device and an air heater. A control method for the air fryer includes the steps of controlling an air flow to be circulated in the air frying chamber of the air fryer via a control of the air circulation device, controlling an air temperature in the air frying chamber via a control of the air heater, and selectively controlling an air flow rate of the air in the air frying chamber according to a texture of the food, wherein the air flow rate is selected to match with the texture of the food to be air-fried.