Multimedia Computer Assisted Instruction MCAI (short for MCAI) is the product of combination of multimedia technology and the CAL technology after the development of multimedia in 90 years. Multimedia Computer Assisted Instruction's realization entails utilizing artificial intelligence and processing complex procedures, such as natural language understanding, knowledge display, reasoning method, application of some artificial intelligence techniques, algebra
explanation, symbols, all of them being used in MCAI system in order to improve its intelligence and practice. In Physical Education, the use of multimedia computer-assisted instruction can realize three-dimensional modeling, graphic simulation,
reproduction of the language sounds, reproduction of static circumstance, showing the dynamic process and promotion of interaction between the two sides of teaching. Its main purpose is to provide students with different physical stimulation and control the direct teaching environment. Rational use of multimedia computer assisted instruction can enable students to maintain the excitability of the nervous system to different stimuli, to master sports knowledge, technology, and skill formation, to overcome the atmosphere where students are tired of study in traditional teaching. In addition, through the use of multimedia computer assisted instruction, it can also broaden their horizons, develop student's intellectual, and promote their development of personality. Multimedia computer-assisted instruction for physical education undoubtedly has a great advantage, and it represents new trend of the current even the whole physical educational technology development.