The sun is the nearest star to our earth, and the periodic activities of the sun could threaten the living environment of the human being. The fierce activities, such as Flares, Coronal Mass Ejection (CME) and so on, are cause by the magnetic field of the sun. These fierce activities could result in the perturbation of the magnetic field of the earth and ionosphere, the interrupt of the wireless transportation, the destroy of the power supply, the trouble of the space probes, the safety of the airman, and it has influent with the development of the space projection. What is the origin of the magnetic field, we thought that there exist a dynamo inter the sun, then we start to study the dynamo theory.
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