Phosphorus (P) is an essential element for the growth of organisms in aquaculture ponds, especially for algae development According to earlier studies, the availability of phosphorus is dependent on the sorption characteristics of the underlying water and sediments and the phosphorus can be released or accumulated from sediments under certain environments (Gomez et aJ., 1999). Models to simulate phosphate adsorption could be useful for pond water quality and lagoon eutrophication management The results indicated that phosphate adsorption was not greatly affected by pH (p0.05). This is probably atbibuted to high proportion of sand in sediments ( 60 percent) which had a low specific surface area and less reactive adsorption sites. The adsorption kinetics of P with initial concentrations of 0.5 and 5 mg PL increased within the first 10 minutes and half hour of incubation, respectively. The Langmuir model satisfactorily described the properties of phosphate adsorption isotherm behaviors of aquaculture pond sediments. According to the Langmuir model the maximum adsorption capacity ( Imax) at pH=5, pH=7, and pH=8.5 was 0.288, 0.267, 0.270 mg/g, respectively.