The financial system of Korean agricultural cooperatives formed a model for cooperative banking strategy. It first started with a national level cooperative-based bank that played a role of mentor for primary cooperative financial business. NA CF-bank and AC-MC consists a dual financial business structure hat has exhibited synergy. The system employed the appropriate business strategy adapting to the environment. Under the regulated planned economy, it pursued fast growth by maintaining close relationship with the government. As the situation changed to the deregulated market economy, the system focused on different strategic measures to increase competitiveness in the market. The implication of the Korean case is that the cooperative financial system requires the appropriate organizational and business strategies in accordance with changing environment in order to succeed as independent financial institutions.