Phosphomycin aminotriol dispersion is used clinically for urinary tract infections, especially for the treatment of lower urinary tract infections caused by sensitive causative organisms, such as cystitis and urethritis. Phosphomycin aminotriol dispersion, an antibiotic, is produced in vivo by the antibacterial activity of phosphomycin, which can block the nutrients necessary for bacterial cell wall synthesis, and has an inhibitory effect on both Gram-positive and Gram-negative bacteria, with a relatively broad antibacterial spectrum, including Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Aspergillus, all of which have good therapeutic effects. Phosphomycin aminotriol dispersion can be used after meals or before bedtime.