Abstract: Engineered cementitious composites (ECC) are mostly used for seismic reinforcement of structures, and their fatigue performance is a major concern in engineering. In order to study the fatigue performance of ECC, the uniaxial tensile cyclic loading test was performed by fatigue testing machine, and the displacement development and cracking behavior in real time were monitored by using digital image correlation (DIC) technology to analyze the dynamic deformation and fatigue law of ECC specimens and establish the fatigue equation. The results show that the strain and axial displacement of ECC specimens develop similarly, which are divided into the initial stage, stable development stage, accelerated deformation stage and damage stage. The smaller the dynamic stress ratio, the faster the strain development and the larger the accumulated axial strain when damage occurs. The stiffness ratio development curve is divided into three parts: Rapid decline stage, stable decline stage and damage stage. The fatigue life of the ECC specimen obeys the two-parameter Weibull distribution well. By establishing two forms of fatigue equations: S-lgN and S-lgN-F fatigue equations, the ultimate fatigue life is brought into the average life fatigue equation, and the fatigue ultimate stress level is 70.80%. The corresponding fatigue ultimate strength is 2.69 MPa.