This paper presents a study of diagnosis methods for human liver. Presently, there are many elders obtained from liver diseases in the case of an unknown before by themselves. If they do not diagnose such liver diseases before, they will die. Presently, there are many methods for diagnosing the liver e.g. a puncture of blood, ultrasound, computed tomography (CT) scan, X-ray and magnetic resonance imaging (MRI). These methods can be selected to verify the liver diseases depending on situations, chances and environments for human living. Therefore, we need to know these methods before, and how to choose suitable methods for diagnosis of our liver.