Informations of phosphorus fractions are important for evaluation of their status in soil and understanding of soil chemistry that influence soil fertility. To obtain such information, amount and distribution of P in different fractions of 20 soil samples of Qazvin province, Iran were determined by sequential extraction methods and their relationships with each other and with soil characteristics were investigated. Total P of different soils ranged from 700 to 1040 mg kg . The clay contents of different samples ranged from 18-52%, CEC -1 from 14.5-33.5 cmol.kg and the active CaCO from 2.9-19.4%. The amount of different P forms i.e. dicalcium -1 3 phosphates (Ca -P), octacalcium phosphates (Ca -P), Al-phosphates (Al-P), Fe-phosphates (Fe-P), occluded-P 28 (O-P) and P as apatite (Ca -P) were determined and found to be ranged from; 1.6-42.3, 72-314, 14.5-54.8, 8.4-34.8, 10 5.9-33.4 and 262-697 mg kg respectively. Simple correlation coefficients showed that Olsen-P had a significant -1 correlation with soluble-P, Ca -P, Fe-P and O-P.A significant correlation was also observed between the P forms 2 themselves, which is presumably a reflection of the existence of a dynamic relation between the chemical forms of an element in soil. Clay with Fe-P and O-P; total P with Ca -P, Al-P and Ca -P; CEC with Al-P and O-P have 8 10 positive significant correlation. Electrical conductivity (EC) with Ca -P and Al-P; organic carbon (OC) with Ca - 8 10 P and active CaCO with Ca -P have negative significant correlation. 3 10