Abstract: The migration behavior of phosphorus（P） in the soil profile is in close relation with environmental question of the underground water body. The question, whether P taking place vertical transportation in the soil, remains not clear. In order to probe into P vertical migration behavior and function mechanism in the soil profile deeply, paddy soil of Shenyang area was selected and studied. The results are as follows: different levels soil absorbs to P can be described with Langmuir equation and the rate of desorption of P was increased with depth of soil levels, which maybe help P to move vertically.