Abstract: In this paper, the authors discussed the evolutionary relationship between mechanics and physics, which unfolds through three distinct phases: separate origins, integrated development, and modern divergence. To begin with, during the ancient Greek period, "Mechanical Problems" authored by Archytas and "Physics" by Aristotle respectively symbolized the diverse origins of mechanics and physics. In "Mechanical Problems", mechanics was defined as a means of "counter to nature" with the assistance of mechanics for people's demands. In contrast, the aim of "Physics" was to gain an understanding of the "origin, cause or element" of nature. Evidently, there were clear distinctions between the two. Approximately from the 3rd century BC to the 18th century, mechanics and physics underwent an extensive period of integrated development. The mechanical accomplishments achieved during this time served as the bedrock not only for the progress of mechanics itself but also for the overall advancement of physics. In the second half of the 18th century, along with the emergence and growth of the theory of electricity and magnetism, the traditional perspective on mechanics began to wane within the realm of physics. Physics then evolved into modern physics, which was characterized by the theories of relativity and quantum mechanics. Meanwhile, mechanics continued to play a crucial role in serving modern engineering and eventually developed into the scientific system underpinning modern engineering technology. Finally, it is worth noting that despite the fact that mechanics and physics have followed distinct development paths, their development should never be separated or isolated from each other. The mutual reference and cross-integration between mechanics and physics have already played a significant role in a number of fields.