The formation and development of paddy soils in Zhujiang Delta is close related with the deposition and formation of the delta; with the enbankment beach land for planting rice,the soils is still under the condition of saliniiation and swamping,due to high salty ground-water table,and the swamping paddy soils are formed.Following the raising of land surfacc of polder fields and the lowering of the ground-water table,the eluviation-illuviation processes are weaker and plowpan is formed; thus the guyed paddy soils are formed.Through long term warping and applying muddy manure,the soil surface is further raised and the ground-water table is greatly lowered,the eluviation-illuviation processes are intensified; the periodically submergic paddy soils are formed.Of course,this is only the rough description of the formation processes on the delta,the human activity and cultivation practice are greatly affect the formation and fertility of the soils.