The paddy soil from Quaternary red clay is generally deficient in P.Owing to phosphate fertilizer having been successively applied for more than 20 years, P is concentrated in topsoil in which the total P is 0.048%, and the available P is 11.6 ppm on the average.It is 1.7 times and 7.5 times higher than those in subsoil, and 2.1 times and 28.4 times higher than those in topsoil of waste soil with scarce vegetation respectively.The distribution of various fractions of P in the paddy soils was closely related with the zonality of main soil group on which the paddy soils were developers.The orpanic P was about 35.4%.The Al-p, Ca-p, Fe-p and O-p were about 5.9%, 30.6%, 28.7% and 34.8% respectively.The organic P and non-occluded P increased after rice season under submerged condition, while they decreased afterwheat season in dry farming.