In this study, I analysed the influence of the Korean Officially Supported Export Credit System upon Improvement upon Korean Export, investigated Korean Officially Supported Export Credit System focussing on the Short-term Export Loan System & Medium and Long-term Export Loan System in Korea Eximbank and sought for the measures overcoming problems therewith. In my research I started from a basic model analyzing Short-term Export Loan & Medium and Long-term Export Loan using added several variables that have effect on export such export relative price, world income and the amount of post-shipment credit bank guarantee. As a result, amount of Short-term Export Loan & Medium and Long-term Export Loan, world income and export relative price showed expected responses and Short-term Export Loan was significant. In case of amount of Short-term Export Loan System was statistical significance.