Variation of soil organic phosphorus fractions, and relationship of organic P and its fractions, with soil organic matter and readily available P were studied with Bowman-Cole method. The results showed that active P₀, moderately active P₀, moderately stable P₀ and highly stable P₀ accounted for 80.2%, 9.8%, 9.0 % and 2.0 % of total P₀, respectively. And combined application of organic manure and inorganic fertilizer significantly increase contents of active P₀, moderately active P₀ and moderately stable P₀, but decreased highly stable P₀. Application of chemical fertilizer increased total amount and activity of P₀. and content of moderately active P₀, but decreased contents of highly and moderately stable P₀, and had no significant influence on distribution of P₀ fractions. Activityand moderately active P₀ showed positive relationship with readily available P, organic matter and total organic P, whereas moderately and highly stable P₀ had nothing to do with readily available P and organic matter.