The flood-plain of Paraíba River and its tributaries form a system of alluvial plains with intensive agriculture occupation. In the area of meandering the river by lateral erosion and deposition, sediments sandy materials, accordingly the caracteristics of mature stream. At the flood period, finer materials are deposited over the former, and the Dourada series is developed. This soil, with simple morphological pattern (A-C horizons) has o small organic accumulation and stratified material generally with light clay texture. The most impressive property is the color, deep yellow (Dourada-golden), followed by the presence of muscovite identified with naked eyes. The profile has subangular blocky struture with strong development but high instability in water. The soil is rich in potassium (exchangeable and non-exchangeable one) but low content in other plants nutrients. The colloidal fraction presents kaolinite, goethite and small percentage of quartz. Several mollecular rations are presented for total and colloidal fraction. The Barro de Telha series dominantes the flood-plain out of meandering belt. The sediments deposited here are decanted from heavy materials and concentrated on clay fraction. This phenomena is produced by velocity breakage of water during flood and travelling of the flood water to the place. The soil profile has heavy clay texture, A-C horizons, subangular blocky and prismatic struture. The gley dominantes troughout the profile and it is absent mica visible with naked eyes. The soil has high content of potassium, low content of others plants nutrients and low pH. The X-rays analysis of clay fraction shows the presence of kaolinite, a mineral with mica struture and quartz at one layer.