A composition for diagnosing, treating, and preventing liver disease, more particularly a composition for diagnosing liver disease comprising a material for measuring the grade of TM4SF5 (transmembrane 4 L six family member 5 or four-transmembrane L6 superfamily member 5) protein, a kit for diagnosing liver disease comprising the composition, a method for providing information necessary for diagnosing liver disease composed of the following steps: measuring the level of TM4SF5 protein and the expressions and phosphorylations of TM4SF5 expression related signaling proteins； and comparing the measured levels with those of the normal control, a method for screening a material for treating liver disease, and a composition for treating or preventing liver disease comprising a material inhibiting TM4SF5 protein expression or the expressions and phosphorylations of TM4SF5 expression related signaling proteins.
