Abstract: Due to the engineering advantages of Shape Memory Alloy (SMA) materials such as shape memory effect, pseudo-elasticity, high strength ratio, corrosion and wear resistance, SMA composites structures have attracted much attention in the field of smart structures. By utilizing the excellent mechanical properties of SMA materials, its combination with concrete materials will have an inhibitory effect on the generation and development of concrete cracks, and repair budding cracks within the concrete through the shape memory effect. In this paper, SMA is built into concrete materials to make a composite SMA concrete structure, the research on crack damage monitoring and repair behavior of composite SMA concrete structure is carried out. Based on the strain transfer theory and the constitutive model of shape memory alloys, an analytical model for crack damage monitoring and repair of SMA-reinforced concrete structures is developed and experimentally validated. The results show that: the larger the martensite content and embedment length are, the larger the strain transfer coefficient is; the relative change of concrete crack damage strain and SMA resistance is generally monotonically increasing; the initial state of SMA is martensitic, its repair behavior for concrete crack damage occurs after the critical temperature, at which the phase transition of SMA austenite begins and the crack repair effect is gradually enhanced as the temperature increases.