Abstract: Crohn's disease, with alternating phases of activity and remission holds the characteristics of a long course, complex evolution and extensive involvement,, which have a huge impact on the life quality of patients. How to accurately and comprehensively identify and assess the onset, progression and regression of the disease, such as whether it is in the active phase, the nature of intestinal strictures, and the presence of other systemic lesions, is particularly important to guide treatment. Evaluation modalities that rely solely on clinical indicators or endoscopy are increasingly recognized as flawed by studies. With increased disease awareness and rapid development of examination modalities, the role of medical imaging in this disease cannot be ignored. In this paper we will focus on the value of CT and MRI for monitoring Crohn's disease in active, fibrosis, intestinal luminal strictures, abscess/fistulas, and extragastrointestinal lesions, and also introduce the application of related advanced technologies.