The purpose of this study is to verify the effectiveness of mental training in motor-performance, by considering previous studies of native and foreign. The results were summerized as follows; 1. The mental training is to make a display of high level performance by controlling psychological condition of oneself. The process of mental training is composed the 7 level-analytical stage, estimation stage, preparation stage, action stage, measurement stage, application stage, appraisement of the effectiveness stage. 2. The method of mental training is mental-rehearsal, relaxation training, concentration training, attention controlling training, psychological skills training, self-confidence training, arousal level controlling training, setting a goal, imagery training. 3. It showed affirmative effectiveness of mental training in dance, Dan-Jun breathing, swimming, golf, basket ball, archery. In conclusion, it has an affirmative effectiveness of high level performance in motor performance if it is doing periodically and continuously that mental training with physical training.