Abstract: A pot experiment was conducted on effect of phosphorus application on iron content in peashrub(Caragana microphylla) in calcareous soil. Results indicate that with increasing P application rate, peashrub shoot increased in dry weight and did the most in Treatment P₃ (100 mg·kg^-1 P₂O₅), by 10.8%～16.7% over CK; at its early growth stage, peashrub in plots low in P application was higher in iron content and the content increased with growth and increase in biomass of the plant. The increase was faster in plots higher in phosphorus than in plots lower in phosphorus. The iron content in peashrub was the highest in Treatment P₃ at the fourth sampling,reaching 1 428.3 mg·kg^-1; and the total iron content in peashrub shoots was also the highest in Treatment P₃ at the fourth sampling,reaching 10.269 mg·pot^-1. So it is quite obvious that peashrub is a good choice for ecological revegetation in iron ore mining areas.