The invention relates to a medicament capable of protecting a cell membrane, comprising main components of fructose-1,6-diphosphate or salts thereof, taurine, L-asparaginic acid or salts thereof, citric acid and vitamin. The medicament can protect the cell membrane, reduce the damage of free radicals to the cell membrane, quickly provide a large amount of energy substances, quickly repair damaged muscle, promote aerobic metabolism and avoid corresponding lactic acid accumulation. The animal experiment proves that the medicament can markedly improve and train the swimming capability of wistars and can prevent skeletal muscle contraction device from being damaged by sports. The medicament provided by the invention is convenient to use, and particularly suitable to athletes practicing endurance events.