We have studied the cytoprotective effect on H$_2$O$_2$ induced oxidative stress from leaves of Carpinus tschonoskii. The methanol extract of Carpinus tschonoskii was found to scavenge intracellular reactive oxygen species (ROS) using flow cytometry and confocal microscope. This extract prevented lipid peroxidation and thus reduced cell death of Chinese hamster lung fibroblast (V79-4) induced by H$_2$O$_2$ treatment. The extract increased catalase activity and phosphorylation of extracellular signal regulated kinase (ERK). Taken together, the results suggest that Carpinus tschonoskii protects V79-4 cells against oxidative damage by H$_2$O$_2$ through scavenging ROS.