The native chieftain system was a mutual-beneficial cooperation between the central government and native chieftains. For a quite long time after the foundation of Ming, the rulers knew that the central government could only use limited amount of resources. Having a large number of armies stationed in southern borderland, an area with harsh natural environment and large number of Non-Han people, was too costly for Ming rulers. Thus, they decided to transfer part of ruling power to those local political rulers in exchange for their defense of the border zone.