A new convenient synthesis of a salty peptide, ornithyltaurine (Orn-Tau), was designed. Compared with a conventional synthesis, the process was shortened by two steps and the purification was made much easier in the new one. Consequently, Orn-Tau was easily obtained and subjected to a further series of experiments. The product produced a good saltiness without Na+ in the presence of HCl, and the saltiness became stronger as the amount of added HCl increased. The best quality of saltiness was obtained by adding 1.2 equiv of HCl to the Orn-Tau solutions. The Orn-Tau . 1.2HCl was equally salty to NaCl on a molar basis and also had an enhancing effect on saltiness of NaCl. The intake of Na+ could be cut by 95% in a model system and by 50% in a food material (soy sauce) by using Orn-Tau . 1.2HCl, which have the most excellent saltiness and Naf dietary effect of our NaCl substitutes at the present time.