Objective To observe the effect of egg yolk lecithin on improving memory. Methods Through avoiding darkness and jumping stair experiments,the improvement of memory was investigated in normal mice and memorial obstacle mice fed with three dosages of egg yolk lecithin. Results Difference was remarkable between middle,high dosage groups and control group( p <0 05).The least effective dosage was 5g/(kg.d). The results of examination which were done before and after training were identical. Conclusion Feed with egg yolk lecithin can improve the memory function in the mice.