A field experiment was conducted to study the effects of different phosphorus(P)fertilizers on soil available P，cotton yield and P fertilizer use efficiency in drip irrigation cotton field.Five kinds of phosphorus fertilizers for drip irrigation were selected in the experiment:monoammonium phosphate (MAP)，ammonium polyphospphosphate (APP)，solid (SF)，suspension (LSF)and clear liquid of water-soluble fertilizer (LCF)and no phosphorus fertilizer was used as control (CK). There were six treatments in total.Soil available P content and cotton growth，P uptake and yield were measured.The results showed that in a period of irrigation fertilization，LCF and APP significantly increased available P content in soil compared with other treatments.The soil available P content in 0～20 cm soil layer of APP increased significantly compared with other treatments in each growth stage of cotton，and the soil available P content in 20～40 cm soil layer of LCF was the highest，which increased 21.41% significantly compared with APP in full bolling stage.APP significantly promoted the dry matter and P accumulation in stem and leaf of cotton at boll opening stage compared with MAP，while LCF had the highest proportion of dry matter and phosphorus absorption in boll，which were 64.89% and 69.28%，respectively.The yield of LCF was the highest，followed by APP，which increased by 8.97% and 2.87%，compared with MAP，respectively.Application of LCF significantly increased P partial productivity and P agronomic efficiency of cotton，while apparent P utilization of APP significantly increased by 20.26% compared with LCF.In conclusion，application of APP and LCF can keep the soil available P content at a higher level，but the liquid soluble fertilizer has a stronger phosphorus migration ability.Both of the two fertilizers (APP and LCF)could promote dry matter accumulation and P uptake，but ammonium polyphospphosphate had the highest apparent phosphorus utilization rate，while clear water soluble fertilizer increased partial phosphorus productivity and agricultural efficiency of phosphorus fertilizer，and the yield increase effect was the most significant.