Abstract: A heating system for compressed parts capable of controlling process atmosphere and pressure includes an accommodating body, a heating device, an atmosphere controlling device, and a processing pressure adjusting device. The heating device is disposed inside or outside of the accommodating body to heat a component to be heated, so as to remove an impurity within the component to be heated. The atmosphere controlling device transports a reaction gas, such as hydrogen, oxygen, water vapor, or plasma, into a cavity for reacting with the impurity within the component to be heated. A phase transition or a chemical reaction can be carried out, such that the impurity is gasified, oxidized, carbonized, or disintegrated. The processing pressure adjusting device uses an inert gas (e.g., a nitrogen gas or an argon gas) to control the processing pressure in the cavity to be from 800 Torr to 10?2 Torr.