Abstract
I will pay attention on how to construct the credit risk system capable of measuring an extent of damage cause to default of debtors (corporate). I set up credit risk model by quoting credit risk evaluation of CreditMetricsTM developed by J.P. Morgan company. Among this study, the transition matrix can be derived from using the rating information of the commercial bank’s debtors, and the default correlation between debtors (corporate) will be discussed by means of Index Information collected from Taiwan Economic Journal (TEJ). Moreover, I will step further to discuss how to evaluate default correlation of the corporate in private. More importantly, a graph user interface will be set up in this paper. Both of single credit VaR(value at risk) and portfolio credit VaR will be calculated in the interface. The interface grabs the necessary data from the database constructed in Microsoft Excel and keeps the credit risk system updated with the latest data. I hope that this GUI will help the commercial bank evaluate credit risk more efficiently.