Abstract: <FONT face=Verdana>Generally,production of sodium salts of phosphate in China was based on industrial phosphoric acid and sodium carbonate or sodium hydroxide as raw materials,however,production cost was relatively high.A new technology of preparing industrial grade sodium dihydrogen phosphate with wet-process phosphoric acid and sodium chloride by continuous extraction method was developed and continuous experimental study was carried out.Results indicated that the quality of sodium dihydrogen phosphate product could reach index requirements of industrial-grade sodium dihydrogen phosphate (HG/T 2767—1996) when amount-of-substance ratio of H<SUB>3</SUB>PO<SUB>4</SUB> to NaCl was 1.1 in solution,volume ratio of the solution (mass fraction of P<SUB>2</SUB>O<SUB>5</SUB> is 14.45%) to extracting agent was 1∶7,extraction temperature was 40~50 ℃,pH of sodium dihydrogen phosphate solution was 4.2~4.5,pH of salt washing solution was 5.0~6.5,and pH of ammonium chloride solution was 8.0~9.0.In addition,principles of experiment,process conditions of continuous extraction method,and product quality and consumption were expatiated,and feasibility of direct production of industrial grade sodium salts of phosphate with wet-process phosphoric acid and sodium chloride was put forward.</FONT>