Abstract: Artificial Intelligence (AI), also known as machine intelligence, is a technology that implements human-like intelligent behavior through computer programs. AI has powerful data processing functions and is currently used in many fields, including face recognition, language recognition, image processing and data mining. Based on a large number of written medical records of patients with malignant tumors and various examination materials, AI has unique advantages in assisting the diagnosis and treatment of malignant tumors. AI can quantify tumor image information that cannot be recognized by the naked eye and operationally link them. It can integrate different types of data streams into a comprehensive tumor diagnosis system, including images, pathological images, genetic analysis data and even electronic health records. This article will review the basic principles of AI and its application progress in assisting the diagnosis of malignant tumors.