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地球历史的节律突出表现为“开”与“合”有规律的组合。“开”、“合”节律应根据地质、地球化学、地球物理、生物等各种信息综合分析而建立，一般可分为全球性、区域性、地区性、露头和微观五个级别的“开”、“合”旋回或韵律。文中综合各方面资料编制了全球“开”、“合”旋回演化简图。古地磁场强度、古地磁场极性倒转比例、古地磁场极性倒转频率和真极移速率在地史上均呈周期变化，与开合构造关系密切，同受全球性因素制约。因此，用“开”、“合”观点研究古地磁可以揭示古地磁的本质特征。通过古地磁的研究有助于确定“开”、“合”环境，恢复“开”、“合”历史，探索“开”、“合”机制。
The rhythms of the earth’s history are prominently manifested as a regular combination of “opening” and “closing together.” The “open” and “closed” rhythms should be based on the comprehensive analysis of geology, geochemistry, geophysics, biology and other information, which can be divided into five levels: global, regional, regional, outcrop and microscopic “,” Together “cycle or rhythm. In this paper, the global ”open“ and ”combined“ cycle evolution diagrams are compiled based on all kinds of data. The strength of paleomagnetic field, the reversal of the polarity of the paleomagnetic field, the frequency of inversion of the polarity of the paleomagnetic field, and the rate of the true pole migration all periodically change in the history of the earth, closely related to the structure of the opening and closing, and constrained by the global factors. Therefore, the study of paleomagnetic from the perspective of ”open“ and ”close“ can reveal the essential characteristics of paleomagnetic. Through the study of paleomagnetism, it helps to determine the ”open“ and ”close“ environment, restore the history of ”opening“ and ”closing“ and explore the mechanism of ”opening“ and ”closing".