Field test of ’3414’P and K fertilizer experiments were carried out on rice in the alluvial-salty soil of northern Jiangsu Province in 2010 and 2011.The results showed that application P,K fertilizer could not significant increase production of rice when soil available phosphorus was more than 12.5 mg/kg and soil available potassium was more than 86.6mg/kg.Increasing amount of P,K fertilizer application reduced the P,K use efficiency.The recommend fertilization amounts were 45 kg/hm² P₂O₅,22.5 kg/hm² K₂O and P,K fertilizer were dressing at sowing.