The learning performance ability of the egg yolk sialyloligosaccharide fraction was investigated. The egg yolk sialyloligosaccharide fraction was administrated to rats aged 14 to 21 days. Goalreaching time and success ratio of goal reaching were measured using maze test on 42-49 days old rats. The results showed that the group which were administered egg yolk sialyloligosaccharides fraction had higher success ratio of goal reaching than control group, and goal reaching time was also reduced significantly as compared to control . The results of this study suggest that the sialyloligosaccharide derivatives might play an important role to improve the learning performance of infants .