Abstract: Starting from the basic characteristics of magnetic materials, this paper explains the operation principle of the magnetic switch and, by using simple experiments, demonstrates its effectiveness in pulsed power generation. Typical usages of the magnetic switch are described, such as pulse compression, magnetic assistance, and saturable transformer. Finally, three types of application circuits are introduced, including pulsed laser driver circuit, high-power accelerator driver circuit, and semiconductor opening switch(SOS) driver circuit.