Objective Study the MRI imaging features of liver tumor Ⅳ lesions and diagnosis value of research. Methods Retrospective analysis of our hospital from January 2010 to December 2014 received during the period of 35 cases confirmed by surgery pathology of patients with liver lesions IV tumours MRI data, targeted analysis of MRI enhancement scanning of the liver lesions IV tumor MRI imaging features and diagnostic value. Results I 35 patients were detected in the liver lesions IV tumors, 32 cases, the detection rate of 91.4%, MRI scan, T1WI and T2WI low signal high signal, border and clear, uniform signal, dynamic enhancement liver Ⅳ segment lesions from the edge to strengthen, gradually fill to the center, strengthen the extent similar to the blood vessels, coronary position and shaft end liver Ⅳ basic segment lesions was filled completely, there is only a few fibrous scar. Conclusion Enhanced MRI in liver pathological changes in the process of the diagnosis of tumors, IV can more accurate diagnosis, is helpful to early surgical intervention, therefore enhanced MRI can be used as the first choice for the liver cancer diagnosis IV method, effectively for the patients combined with other imaging methods in clinic treatment.