To study the improving memory function of fish oil from Eels, the diving test, evading-dark -room test and water maze test were carried ont. Doses of 0,150,300,900 mg/kg BW for 30 days were selected for the mice study. The results indicated that the fish oil could improve the memory acquiring and reappear capacity in the passive evading reaction and space distinguishing. The human experimentation using Wei's Memory Scale could also present the memory improving effect with the dose of 2.4 g per day.