To the problem of different profile morphological characteristics("flat type"section and "wave type" section) under continuous cultivation of corn formed under different tillage conditions have significant influence to corn yield in Songliao plant,this paper systemically studied moisture characteristics and influences under different profile morphological characteristics.The results show that: "flat type" section has better soil structure and appropriate pore ratio,which improved the soil permeability,reduced soil erosion.The corn water-consumption of "wave type" section cultivated horizon is bigger than that of "flat type" section.Soil water could appear shortage in "wave type" section,especially in the post period.Through measuring rainfall contents of growing the season,the rain of the "flat type" section is slightly surplus,but that of the "wave type" section is shortage.Therefore,"wave type" section cultivated horizon may occur drier phenomenon much easier than "flat type" section.This may be the main reason why drier phenomena easily happen in the black soil.Under this kind of the phenomena,corn growth excessive depends on the rainfall of a year,and it will appear the high motion to the year's yield.