The present paper deals with the effect of intensity of weathering process during soil formation on the composition,distribution and transformation of phosphorus of various soil types fractions of soil particle sizes in soil types of China.Studies indicated that the higher the weathering degree of the soil,the greater the relative contents of total phosphorus,available phosphorus and organic phosphorus in clay.For example,the total phosphorus in clay fraction was five times as much as that in sand fraction of latosol,while this ratio fell below two in dark loessial soil which was more weakly weathered compared with the former.It was also showed that the forms and distribution of inorganic phosphate were also affected by the weathering process.In dark loessial soil the occluded phosphate might be up 47% of total inorganic phosphate in clay fraction,far higher than that in the original soil.