Pressure sensors play a vital role in the management and function of nuclear plants, providing essential data (such as steam pressure and helium pressure) for monitoring the functioning of the plant, but the harsh working environment in nuclear plants will cause performance degradation of those sensors, affecting safety and normal functioning of the plants. Thus, assessing their working state is an important subject in nuclear plant maintenance, but the process is usually complicated and costly, affecting overall efficiency. Therefore, it’s necessary to theoretically estimate their performance degradation in the environment of nuclear plants, in hope of better assessing their service life thus reducing costs on maintenance. The objective of this paper is to review and analyze the influence of mechanical factors on the primary components of fiber-optic pressure sensors based on Bragg gratings mentioned in existing literature, with a view to providing references for further research. The possible influence of mechanical factors on sensors is first given. By reviewing and summarizing relevant literature on performance of the optical fiber cable under mechanical factors such as vibration, pressure, and impact, analyzing the influence of shear stress, creepage and crack development on optical fiber cable and the influence of creepage on coating material mentioned in existing literature, this paper then summarizes the mechanism of those possible influence, looking forward to estimating the performance degradation of the sensors under such factors.