The hot-section components of aero-engines operate under extreme conditions characterized by high temperatures, high pressure, and high rotational speeds. Precise measurement of dynamic strain is critical for accurately evaluating stress distribution and fatigue life, as well as for the early identification of critical failure points. This paper systematically investigates a high-temperature dynamic strain measurement method based on fiber optic sensing technology. High-temperature-resistant grating structures, inscribed using femtosecond lasers, were installed and fabricated on the substrate surface via plasma spraying technology. The performance of the sensors was tested and evaluated using high-temperature static and dynamic strain calibration rigs that simulate the operating conditions of hot-section components. Finally, validation was conducted through two aero-engine test rig experiments: 1.Disk Rig Tests: Designed to assess high-temperature endurance and measurement accuracy. Results demonstrated that the sensors could withstand environments up to 650°C, with a deviation of less than 5% between measured centrifugal strain and design simulations. 2. High- and Low-Cycle Fatigue Rig Tests: Designed to verify dynamic strain measurement capabilities under blade vibration loads. Results indicated a discrepancy of approximately 1.3% between measured and theoretical resonance frequencies, while the dynamic strain amplitudes were consistent with the predicted design magnitudes.