Abstract: China is rich in phosphate rock resources，which have brought great opportunities for the development of phosphate industry.Ammonium dihydrogen phosphate as one of important phosphate series products，commonly used for N-P compound fertilizer，but the fertilizer utilization rate is low，and value-added is not high，caused resource waste and hindered the development of phosphorus chemical industry.Applications of ammonium dihydrogen phosphate as fire extinguishing agent，flame retardants，glass material，lithium iron phosphate material and matrix modifier etc.were emphatically summarized， which provided reference for expanding the application fields and enhancing the added value of it. Finally，the research direction of the ammonium dihydrogen phosphate in the future was also prospected.

Key words: ammonium dihydrogen phosphate, phosphate, phosphate rock