A series of two experiments assessed the effect of EMG biofeedback on the perceptual-motor coordination process in continuous motor task. In the experiment 1, in order to investigate the effect of EMG biofeedback, compensatory tracking was used. In the experiment, for evaluation of the biofeedback, step wave methool was used while the changing margin being 1 V to 2 V. Twenty seven subjects were randamly assinged into three condition groups, i. e., visual feedback condition group, visual + auditory feedback condition group and visual + EMG biofeedback condition group. In order to investegate the state of motor learning, the recorded integrated error was measured. In the experiment 2, in order to compare the first half term of EMG biofeedback training with the latter half term of EMG biofeedback training, pursuit tracking method was used. In non-EMG biofeedback condition, the sine wave target, method was used and its four frequences ranging from 0.102 Hz to 0.503 Hz transfer function. In EMG biofeedback training condition, the step wave target, method was used while the margin ranging from 1 V to 2 V. Twenty four subjects were randamly assinged into three condition groups, i.e., group-1 (the latter half term of EMG biofeedback training), group-2 (the first half term of EMG biofeedback training), group-3 (non-EMG biofeedback training). In order to investegate the state of motor learning, the recorded integrated error was measured, furthermore a real time correlater and fourior transform apparatus were employed to obtain power density spectra in the frequency domain of target, and to obtain crosspower density spectra between target and response. These data were expressed on a error power spectra. The results were as follows : 1) significant decrease in integrated error values was showed by visual + EMG biofeedback condition group and visual + auditory feedback condition group; 2) after the EMG biofeedback was excluded, the effect of the EMG biofeedback remained; and 3) the application of EMG biofeedback was effective in the latter term better than the previous term.