The optimized conditions of hydrolysis were determined as SEBstar HTL enzyme concentration at 0.04%, temperature at 90 degree C, hydrolysis duration of 60 min and pH of 6.0. This hydrolyzed starch solution can be used for subsequent saccharification and has a DE value of 6.48 and can be used for saccharification at the next stage and has devised a process to produce maltodextrin from sweet potatoes material of Vietnam.