Abstract: In order to optimize the formula of purple sweet potato nutrition power, the experiment were arranged according to Box-Behnken central composite experiment design. Four independent factors of additive amount, such as the skimmed milk powder, the soybean phospholipids, the carboxymethylcellulose sodium, the non-dairy creamer were considered on the basis of single factor experiments.The results showed that the optimum formula of purple sweet potato power were as follows: skimmed milk powder 16%, soybean phospholipids 0.25%, carboxymethylcellulose sodium 0.30%, non-dairy creamer 8%, aspartame0.17%, diluted roasted flavor 15%, maltodextrin 13%. The experimental composite score 89.4 was in good agreement with its predicted value 88.4 by model.