Abstract： A Timoshenko beam vibration model was built by considering the recovering stress of NiTi to predict the frequency tuning characteristics of NiTiAl beam. The recovering stress of NiTi resulted in the compressive stress in Clamped-Free (CF) beam which caused the frequency to decrease. For a 80 mm length CF beam with 8% of NiTi (prestrain 3%) embedded, the base frequency decreased by 52.1% when heated to 80 ℃, while the stress status of Clamped-Clamped (CC) beam depended on the combined effect of thermal expansion and NiTi recovering stress. At least 20% of NiTi should be embedded to increase the frequency of CC beam. Finally, theh NiTiAl MMCs beam was manufactured by ultrasonic welding process. A thermal modal experiment was conducted to study the frequency tuning characteristics of NiTi-Al CF beam. The results show that by embedding NiTi the frequency of the beam could be effectively tuned. The experimental data conforms to the theoretical data.