Abstract: This article reviews the recent advances in dislocation, crack and fracture. The main contents include:(1) Taking the temperature dependence of yield strength as an example, we discuss the structure sensitivity of mechanical property in order to understand the relationship between the structure of dislocation core and plasticity; (2) Pure elastic fracture is always rare, so th at under the action of stress,a plastic zone(large or small),and interactions between crack and dislocations always exist at the cra...