Study of those documents reveals that in addition to the use of force and deception by the Chinese settlers, a major reason for the inexorable depletion of aboriginal territory was the fact that land rights were frequently ceded to the Han Chinese in return for irrigation and loans.
經由岸裡社古契約的研究，可以發現，平埔族土地的流失，除了漢人的拐騙與搶奪，原住民以土地使用權向漢人換取水渠的興建或借貸，更是平埔族的土地一點一滴流失的一大原因。