A contrast experiment in field and a rhizosphere experiment in greenhouse were conducted to study ion transport in soil-crop rhizosphere system under different conditions. Salts of irrigation water were accumulated in the surface layer of soil under fallow conditions, but in the root zone of soil under cropping conditions. Cl^-、SO₄^2-、Na⁺、Ca²⁺,Mg²⁺,were accumlated in the rhizosphere of wheat in the process of irrigtion with mineralized water, but K⁺ was depleted in the rhizosphere. The differences of ion concentrations of soil solution between rhizosphere and nonrhizosphere became larger with the growth of wheat. The accumulation and depleted of ions in rhizosphere related to the uptake amount and rate of ions by crop. Cl^-、SO₄^2-、Na⁺、Ca²⁺ and Mg²⁺ concentrations of soil solution in rhizosphere and nonrhizosphere decreased with the increase of leaching water volume. The descending rates of ion concentrations in soil solution of rhizosphere were obviously lower than those of nonrhizosphere. More Cl^- than SO₄^2--was leached out both in rhizosphere and in nonrhizosphere.