Obsessive-compulsive and impulsive symptoms have trans-diagnostic characteristics in phenomenology. Impulsivity is an important dimension of the pathological psychological mechanism of obsessive-compulsive disorder. An increasing number of studies suggest that impulsivity in obsessive-compulsive disorder involves multiple neurocognitive functions， with complex pathological mechanisms and difficulties in clinical intervention. This paper reviews the theoretical models， biological mechanisms， psychological characteristics， and clinical interventions of impulsivity in obsessive-compulsive disorder from a trans-diagnostic perspective， aiming to provide reference for further research and clinical practice.