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Abnormal diagnosis is a big problem in the electronic cyclotron resonance heating control system. Since the signals for controlling the gyrotron are numerous and the real-time control requirements are high, the general delay requirement is on the order of microseconds. In the event of a fault, the control system immediately shuts down the high voltage power supplies to protect the gyrotron. If you want to find out the cause of the abnormality, you can only connect each signal to the oscilloscope and wait for the fault to occur again when it is captured by the oscilloscope. This is not only difficult to locate the abnormality, but also time-consuming and labor-intensive. Aiming at the above problems, the abnormal diagnosis logic of the central controller of the electron cyclotron resonance heating system is designed. The diagnostic logic is mainly based on the normal gyrotron control flow, and the abnormality occurs by judging the direction of the gyrotron control flow and various detection input signals. The diagnostic logic and the normal gyro control logic are embedded in the same field programmable gate array chip and run concurrently. The simulation results show that the abnormal signal can be output to the computer immediately when a fault occurs, real-time online fault detection and diagnosis is realized, and the whole electron cyclotron resonance heating control system is more intelligent.