Control method for a heating device and a heating device

A control method for a heating device, the heating device comprising a cavity for placing an object to be processed, and an electromagnetic wave generation system for generating electromagnetic waves in the cavity to heat the object to be processed, wherein the control method comprises:

• a step of determining an initial frequency:
• controlling the electromagnetic wave generation system to adjust the frequency of the electromagnetic waves it generates within an alternative frequency range at a test power, obtaining reflection parameters corresponding to each frequency generated by the electromagnetic wave generation system, and determining an initial frequency based on the reflection parameters;
• a step of heating the object to be processed:
• controlling the electromagnetic wave generation system to generate electromagnetic waves at a power of a heating power and a frequency of the initial frequency to heat the object to be processed;
• wherein
• the test power is less than the heating power.