Objective The Thesis aims to probe into the Clinical application value of dual-source CT’s dual energy scanning in the diagnosis of liver tumor. Methods We have took a comprehensive researches and analysis on the clinical image data of 50 liver tumor patients under the dual-source CT’s dual energy scan during the period of June 2013 to May 2014 in our hospital. Results With the analysis of different scan ways picked by the patients, and comparison with the value of TNE and VNC CT of the liver spleen aorta abdominalis Muscle behind muscles, it shows the difference between the two is not statistically significant(P>0.05). The value of primary carcinoma of liver related with TNE and VNC CT which is reflected on the substantial iodine density image is lower than that of hepatic hemangioma and cholangiocellular carcinoma, however, the difference is statistically significant. Conclusion Dual energy scanning has the potential Clinical application value in the diagnosis of liver tumor, which should get a big promotion and application.