The invention discloses seafood for special dietary uses for hypomnesia patients, which is prepared by mixing food-derived marine oligopeptides serving as main raw materials with marine bioactive polysaccharides, and dried marine algae powder, nutrient amino acids, oligosaccharides, nutrient, vitamins and mineral matters serving as auxiliary materials. The seafood for the special dietary uses canbe prepared into powdery or granular food and eaten after being dissolved by warm water, is easy to dissolve, favorable for improving the nutritional statuses of the hypomnesia patients and suitable for the hypomnesia patients to eat, has maximum biological absorbance and the maximum bioavailability for human bodies, provides superior marine proteins, active factors and nutrient components for organisms, supplements a plurality of vitamins and mineral matters required by the human bodies, is, and under the combined action of a plurality of factors such as the food-derived marine oligopeptides, the bioactive components of the marine bioactive polysaccharides, the dried marine algae powder, the nutrient amino acids and the like, can adjust an endocrine system, enhance metabolism, inhibit a cerebral excitement process, alleviate brain fatigue and remarkably improve memory.