The training of skiing is difficult because of environmental requirements and teaching methods. Therefore, we propose a virtual reality ski training system using an indoor ski simulator. The system is based on a simple indoor ski simulator with two trackers to capture the motion of skis. Users can control the skis in the virtual ski slope we provided and train their skills with a replay of a professional skier. The training system consists of three modules: a coach replay system for reviewing pro-skiers's motion; a time control system that can be used to watch the detailed motion of both the coach and the user; and a visualization of the angle of the skis to compare the difference of motions between the users and the coach.