To summarize our interpretation of the results, we can explain shown below. Optimum con dictions in order to soften of sea tangle leafs were treated in the solutions of 0.05% $CH_3$COOH at 9$0^{circ}C$ for 0.5 hour, 0.2% $K_2$HPO$_4$at 10$0^{circ}C$ for 0.5 hour and 0.3% NaHCO$_3$at 10$0^{circ}C$ for 0.5 hour. After sea tangle leafs were treated in the solutions of 0.05% $CH_3$COOH at 9$0^{circ}C$ for 0.5 hour and added 10% seasoning agent of 0.5% glutamic acid, 3% glycine, 5% sorbitol and 1.5% soy sauce. Contents of free amino acid in the leaflike tea were a large amount as alanine of 707.2 $mu$mo1/100$mell$ and glutamic acid of 343.6 $mu$mo1/100 $mell$. And contents of mineral were order Na of 49.38 ppm, Mg of 10.72 ppm, K of 10.56 ppm and Ca of 6.55 ppm. Powder tea was added 0.05% glutamic acid, 5% glycine, 5% glucose and 4% sodium chloride in sea tangle powder, and then pressure treatment at 11$0^{circ}C$ for 1.5 hours. Contents of free amino acid in the powder tea were a large amount as glycine of 222.04 $mu$mo1/100$mell$ and glutamic arid of 208.58 $mu$mol/100$mell$. And contents of mineral were order Na of 104.24 ppm, Mg of 14.31 ppm, K of 9.68 ppm, Fe of 2.36 ppm, Ca of 2.00 ppm, Zn of 0.13 ppm, Cu of 0.10 ppm and Mn of 0.01 ppm.