This paper discusses the dynamics of the solar wind plasma based on solar wind origins. The MHD (Magnetohydrodynamics) and its formula derivation are reviewed, especially its features of discontinuous structure and rotation discontinuity, as shown by one dimensional space structure diagrams. By analyzing the satellite detection results, it is found that there are two magnetic field direction discontinuity surfaces: one is a tangential discontinuity (TD), and the other is a rotation discontinuity (RD). It is shown that for the TD, the magnetic-field component of the vertical discontinuity surface is zero and the electricity ions do not go through the surface. While the bilateral magnetic field directions of the RD are different, the size is the same and the electricity ions go through the discontinuity surface. It is observed that the rotation discontinuity surface in the solar wind is mainly related with the high-speed solar wind. The magnetic flux through the interface remains unchanged, the magnetic field in the tangential direction can change along any direction, therefore, the rotational discontinuity can be observed. By conparing the derivation results with the data verification diagrams, it is shown that the data diagram analysis supports the derivation of the formula and then proves the system of the rotation discontinuity of the solar wind origin area plasma.
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