Abstract: Fractions of phosphorus in cultivated and vegetable soil in northern China was studied. The main results showed that the content of total P,inorganic P, organic P in vegetable soil was 2.7～14.0 times as much as in cultivated soil.The percent of Olsen-P to total P and Ca2-P Ca8-P, Al-P, Fe-P to inorganic P was higher in vegetable soil than in cultivated soil. The contend of Olsen-P,Ca2-P, Ca8-P, Al-P in the profile of 20～40cm,40～60cm, 60～100cm soil were accounting for 34.6%, 15.3%, 10.7% of the depth of 0～20cm soil, respectively. The contents of total phosphorus and inorganic phosphorus in the profile of 20～40cm,40～60cm, 60～100cm soil were accounting for 44.0%, 30.4%, 23.6%. The positive correlation coefficient was indicated that Olsen-P was correlated significantly to total P, inorganic-P,organic-P,Ca2-P, Ca8-P, Al-P, Fe-P.