A crucial factor for the prevalence of the lineage system in the Pearl River Delta was the region's cultivation system under which both water and land performed important functions. Since the mid-Ming, the rise of commercialization had spurred the popularization of the lineage and the spread of this institution among the common people. Taking the advantage of commercialization, the local gentry incorporated a commodity consciousness into the lineage ethics and applied it in business practices. Sandy land was product of the integration of lineage power and commercial profit. Ecological characteristics and government policies limiting private occupation of the sands turned almost all the sandy land into lineage land. Lineage land then enhanced the economic strength of the lineage. Grains produced in the sandy land area supported the commercialization of the fields and the embanked land which had been converted into cash-crop area. Land system; lineage, and commercialization were thus interrelated and they worked to further each other's development.