Purpose <p>The main purpose of this study is to address the challenges in existing lower limb rapid strength assessment methods, which include high requirements for sensor accuracy and range, as well as complex operation. This paper aims to design a new method and system for assessing lower limb rapid strength using flexible force-sensing sensor arrays, with the research question focusing on whether this approach can provide a scientific, convenient, and low-cost evaluation solution.</p> Methods <p>The proposed system integrates a flexible force-sensitive sensor array to collect pressure data from a lower limb motion pressure pad. This data is transmitted to a host computer, where a lower limb rapid strength assessment algorithm processes and analyzes it. The system also visualizes the data and displays the assessment results. Additionally, a time compensation algorithm was developed to minimize errors, and the system was tested and verified in real-life scenarios.</p> Results <p>Testing demonstrated that the system accurately evaluates athletes’ lower limb rapid strength. It achieves this while reducing the required sensor accuracy and range compared to existing methods, thus validating its effectiveness in practical applications.</p> Conclusion <p>The developed system offers a feasible solution for the scientific, convenient, and low-cost assessment of lower limb rapid strength, overcoming the limitations of previous methods by leveraging flexible force-sensing technology and optimized algorithms.</p>