For improvement of data mining technology, the advantages and disadvantages on respective data mining methods should be discussed by comparison under the same condition. For this purpose, the Coronary Heart Disease database(CHD_DB) was developed in 2004, and the data mining competition was held in the International Conference on Knowledge-Based Intelligent Information and Engineering Systems(KES). In the competition, two methods based on soft computing were presented. In this paper, we report the overview of the CHD_DB and the soft computing methods, and discuss the features of respective methods by comparison of the experimental results.