1. Objective This study was conducted to research a corelation between the Sasang constitutions and primary cancer organs in cancer patient with their thermography. 2. Method We Analyzed the thermography taken from cancer patients and compared it with their cancer origins and Sasang constitution. 3. Result It was found that there are some relationships between the cancer origins and abnormal skin temperature. Also according to the Sasang constitutions of each cancer patient, the lesion of abnormal skin temperature could be differentiated. 4. Conclusion Thermogram can be affected by both the constitution and the primary cancer organs of the patient. To utilize the thermography as a diagnostic or prognostic method of cancer, further studies are needed.