In the electromagnetic compatibility design stage of a large electronic platform, it is hard to complete the spectrum allocation due to the difficulty in predicting the electromagnetic frequency interference of transmitters and receivers. In real scenarios, there are few prediction methods and appropriate analysis and it is difficult to show the frequency compatibility in the system, commonly because of data missing and the abstract EMC design specifications. To solve this problem, we propose an electromagnetic compatibility prediction method based on the transmitter spectrum and receiver sensitivity, with which the frequency compatibility of multiple transmitters and receivers working simultaneously can be predicted using some frequency parameters of transmitters and receivers. The predicted outcome is about the existence of the interference between these devices when they work simultaneously and the exact frequency bands where the interference occurs.