The alterations in liver function in patients after major liver resection are complex. Partial hepatectomy surgery is considered as a selective therapeutic approach in many benign and malignant liver tumors, secondary metastases, and liver trauma. According to surgical techniques most often based on vascular control and hepatic venous closure (Pringle maneuver), related complications such as ischemia and decreased venous return during and after surgery can be seen. In this study, the effects of Mannitol and N-acetylcysteine, on liver function, after hepatectomy surgery, were compared. This study was shown that infusion N-acetylcysteine next to mannitol, in partial hepatectomy surgeries, was not the significant difference to improve liver function, hemodynamic status, and laboratory tests.