Abstract
This paper investigates the symmetry between Coulomb force and magnetic force, and discovers that this symmetry can be generalized to all fundamental interactions. Inertia force and gravitational force are symmetrical. Coulomb force and magnetic force are also symmetrical. Through constructing a mechanism, weak interaction and strong interaction are symmetrical under certain conditions. The general laws of this symmetry of fundamental interactions are summarized. The research finds that there is a symmetry between fundamental interactions and three-dimensional space. Based on the symmetry between fundamental interactions and spatial dimensions, a model of the origin of the universe is proposed. The symmetry of fundamental interactions provides a new perspective for many known phenomena and reveals new results.



![Author ORCID: We display the ORCID iD icon alongside authors names on our website to acknowledge that the ORCiD has been authenticated when entered by the user. To view the users ORCiD record click the icon. [opens in a new tab]](https://www.cambridge.org/engage/assets/public/coe/logo/orcid.png)