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This paper was aimed to explore the effect of three-dimensional ultrasound and MRI (magnetic resonance imaging) in the staging diagnosis of endometrial cancer (EC) with hepatitis B virus infection and construction of mathematical model. The paper selected 31 patients with endometrial carcinoma with hepatitis B virus infection who were admitted to the hospital and who were diagnosed as endometrial carcinoma with hepatitis B virus infection. All patients underwent three-dimensional ultrasound and MRI. The results of the joint examination were compared with the final pathological diagnosis analysis, and the pathological diagnosis was used as the gold standard, and the detection rate and the coincidence rate of each examination result were calculated. The binary logistic regression mathematical model was established to analyze the fitting effect. The results of the study showed that the detection rates of 3D-TVUS (3-dimensional transvaginal ultrasound), MRI, and 3D-TVUS*MRI were 64.5%, 71%, and 96.8%, respectively. 3D-TVUS was statistically significant compared with 3D-TVUS*MRI results. MRI and the 3D-TVUS*MRI results were statistically significant. The difference between the three methods was statistically significant (P < 0.05). The coincidence rate of 3D-TVUS*MRI was higher than that of 3D-TVUS or MRI single examination. For Ia and Ib, the difference was statistically significant (P < 0.05), and in stage Ia. The staging results of MRI were compared with the staging results of 3D-TVUS*MRI, and the difference was statistically significant. Moreover, the fitting prediction effect of mathematical model was excellent. Clinical trials have verified that the diagnosis and staging of endometrial carcinoma with hepatitis B virus infection by 3D-TVUS*MRI is significantly better than 3D-TVUS or MRI single examination, which can better guide clinical treatment.