Experiments were performed lifting at the lifting machine and EMG and ECG were adhered to the body of subjects.Two different weights of 10 kg and 25 kg were by turns set at litfting machine by means of filling pebbles in to bags and placing on the plastic box.These two weights are the weight of subjects that the workers of Mando Machinnery Corporation Ltd. usually do their jobs in relation to manual materail handling. Information on the weights were not given to the subjects.The method of NIOSH Lifting Equation in 1991 was applied to the experiment of lifting