The present invention because the anthocyanins are large amount is significantly improved in nutritional and functional surfaces, casual and nothing to drink the solids content is reduced compared to conventional yogurt manufacturing method of the symbols is improved, purple sweet potatoes containing yoghurt and therefore made by the purple relates to a potato-containing yogurt and concentrated to 1, purple and by using the liquefied and secondary enzymatic treatment by the primary enzymatic treatment and then grinding the potato glycosylated sugar content of purple sweet potato concentrate to 50 to 75 ° Brix a first step of preparing a purple sweet potato concentrate (2) the second step a mixture of sugars, dietary fiber additive and the purple sweet potato, purple sweet potato syrup concentrate for preparing a (3) dissolving a nonfat dry milk oil crude or reduced, and when the freeze-dried powder mixture titratable acidity (titratable acidity) of the lactic acid fermentation broth after fermentation by inoculating the lactic acid bacteria reaches 0.75% cooled to claim for preparing a lactic acid bacteria fermentation broth is lactic acid fermentation is completed 3 process (4) a fourth step of mixing with stirring the lactic acid fermentation broth of the third step and purple sweet potato syrup of the second step And (5), the preference degree for the 5th, according to the production process of purple sweet potato-containing yogurt of the present invention comprising the step eliminated at all resistance to drink is a formulation appropriate solids content of yogurt filling and packing the mixed solution It is not only containing the anthocyanin component is much contained in the purple sweet potatoes to be greatly improved can be widely used as a lactic acid bacteria fermentation products of the growth of childrens nutrition, as well as the additional vision enhancements, improved blood flow function and blood pressure lowering function a healthy diet of the
