Abstract: Objective and MethodThe aim of this text was mainly to study effects of DAP and TSP fertilizer different levels on the total P and available phosphorus in cotton-field soil at all growing stage.ResultThe results showed that phosphate fertilizer can increase soil available phosphorus, total phosphorus content different levels of phosphorus in the cotton seedling-stage and budded-stage the soil of application TSP were significantly more than DAP at soil total phosphate and available phosphorus; In the all growing stage of cotton , there were no significant difference between the cotton plant applied with DAP all levels and TSP(P_2O_5) at 75,150 and 300 kg/hm~2 levels and the cotton plant without aplication of phosphorus fertilizer.ConclusionSo advice was given that application of phosphorus 150 kg/hm~2 could meet the needs of cotton plant.