Abstract: Magnetic resonance imaging diffusion weighted imaging（DWI）as a non-radiation and non-invasive examination method, has shown its unique advantages in diagnosis and staging of esophageal cancer. The ADC value has demonstrated clinical application value in the therapeutic assessment. Application of DWI and CT image fusion could combine the advantages of CT in anatomical structure and the advantages of MRI in clinical stages and diagnosis. The accuracy of target area sketching would be improved.