The sweet potato was the experimental material in this paper. Effect of different solvents on the extraction of sweet potato protein were investigated. The results showed that: the extraction rate with different solvent of soluble protein from sweet potato, following the order of 0.1 M NaOH solution > water > different content NaCl solution. The purity of protein powder were following the order of water > different content NaCl solution > 0.1 M NaOH solution. The concentrated volume, protein cont...