1. Agriculture: phosphoric acid is the raw material for the production of important phosphate fertilizer (superphosphate, potassium dihydrogen phosphate, etc.), and also the raw material for the production of feed nutrients.

2. Industry: treat the metal surface, and form insoluble phosphate film on the metal surface to protect the metal from corrosion. Mixed with nitric acid to improve metal surface finish. Production of washing products, production of phosphorus flame retardant raw materials.

3. Medicine: phosphoric acid can be used to prepare phosphorous drugs, such as sodium glycerophosphate, etc.

4. Food: Phosphate is an important food additive, which can be used as a nutritional enhancer.phosphoric acid is also one of the food additives. As an acid and yeast nutrient in food, cola contains phosphoric acid.