Abstract: The effect on single plant and population efficiency of different fertilization levels and population structure on egg plant was studied in this article. The results showed: With the increase of plant density, yield of per plant reduced. Effect on population yield of density was related with fertilization level. Low fertility need low density and high fertility may raise density, the variety will get stable and highest yield. With the increase of plant density, supplement effect of single plant and population decreased. And the highest level of fertilization, the lowest supplement effect decreased.