As cardiac magnetic resonance imaging technology advances, T1 mapping has emerged as a non-invasive method offering visual and quantitative insights into myocardial fibrosis, edema, and infiltration associated with cardiac diseases. The application of T1 mapping in myocardial diseases allows for evaluating both focal and diffuse myocardial fibrosis, playing a crucial clinical role in the differentiation, treatment, and prognostic risk assessment of diseases. This article aims to provide a thorough overview of the clinical applications of T1 mapping in patients with cardiomyopathy, summarizing the commonly employed scanning techniques and imaging principles.