As a new strong field physical process, RSE has attracted the attention of many researchers, who have some knowledge of its physical mechanism. However, whether the output of Rydberg state, the population of the main quantum number and the dynamics of Rydberg electrons can be controlled by means of external field has not been reported. In this chapter, we use a three-dimensional semiclassical model to study the effect of external magnetic field on the RSE process of He atom. It is found that the external magnetic field not only changes the RSE probability and quantum state distribution of He atom in the linearly polarized laser field, but also makes its dependence on the laser ellipticity significantly different. By analyzing the energy change and motion track of Rydberg electrons in the laser cycle, we can understand the physical mechanism of Rydberg state excitation and the regulation principle of the external magnetic field on the strong field excitation of atoms in the laser field, which provides theoretical support for the realization of the external magnetic field regulation of Rydberg state excitation and other strong field physical processes.<br>
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