Abstract: Objective: To investigate the MRI features of uterine carcinosarcoma, to improve the accuracy of MRI diagnosis.Methods: The MRI findings of 7 cases of uterine carcinosarcoma confirmed by pathology from January 2017 to December 2017 were analyzed retrospectively.Results: The volume of the uterus increases and the lumps in the uterine cavity increase.Larger size of lesion(6 cases with maximum diameter greater than 5 cm).Irregular form, in a leaf shape, the boundaries are not clear.MRI features: Flat sweep T₁WI is equal low or mixed signal, T₂WI is equal, slightly higher mixed signal, partial bleeding.The real part of the lesion DWI is high signal, the ADC diagram is low signal, the average ADC value is(1.105±0.136) ×10^-3 mm².Enhanced scanning uneven enhancement, the venous phase and the delayed phase continue to strengthen, there was no enhancement of internal hemorrhage and cystic necrosis.Some tumors invade the cervix, and it is released into the neck tube.Part of the pelvic and retroperitoneal lymph nodes.Conclusion: Size and shape of the lesion, DWI high signal, higher ADC value, early and continuous strengthening, contribute to the diagnosis and differential diagnosis of uterine carcinosarcoma, MRI has a more important significance on the depth and extent of tumor invasion.