Yellow-clayed paddy field is one of the soil types with medium or low cropyields.The changes in soil contents of phosphorus composition was studied by site-specific experiment，five treatments were setup:chemical fertilizer(NPK)， chemical fertilizer plus four application rates of Astragalussinicus L.(12000，24000，36000，48 000 kg·hm -2).Theresults showed that the contents of available phosphorous(AP)and total phosphorous(TP)increased in fertilization plus AstragalussinicusL.treatment.Compared withNPK，the contents of AP and TP increased by 10.23%～ 22.69% and3.09%～ 13.31%respectively，the highest growth rate was found in the treatment of chemical fertilizer plus 24 000 kg·hm -2Astragalussinicus L.(NPK+MV2).The proportions of organic and inorganic phosphorus were between 36.52%～ 43.14% and 56.86%～63.48%，respectively.Fe-P and O-P were the main compositions of inorganic phosphorus.By contrastwithNPK，the contents of inorganic phosphorusincreased，when the amount of AstragalussinicusL.was less than 24 000 kg·hm-2，the increase wassignificant，however，when the amount was more than 24 000 kg·hm -2，the difference wasnot significant.Contrasted onNPK，the rice yields increased by 12.51%～23.01%，the treatment of NPK+MV2 wasthe most effective way to increase rice yields，with an increase of 1 345.7 kg·hm -2.In conclusion，compared with onlyfertilization，fertilization plus AstragalussinicusL.could increase the contents of soil phosphorus，rice yields.24 000 kg·hm-2Astragalus sinicus L.with chemical fertilizer was the comparatively suitable applied in yellow paddy field.