Abstract: In using the intelligent training planning system, the historical data in the system database will be increased day by day. Whether people can make use of these valuable data and discover some implicit knowledge of training methods, to better assist the user to complete the training plan, which has become a concern. Based on roughset theory, how to process the historical data is explained, and a knowledge discovery method for the historical data is presented. Finally, it gives a example to illustrate the knowledge discovered by this method has great practical significance.

Key words: training planning system, training measure, athlete performance, rough set, knowledge discovery