[Objective] The effects of constant phosphorus fertilization on corn seed production were studied to provide the basis for reasonable phosphorus fertilizer application.[Methods] Field experiments and laboratory analysis were conducted in irrigated desert soil and alluvial soil.[Results] Except for Ca₂-P, total phosphorus, available phosphorus, total inorganic phosphorus, total organic phosphorus, and the other fractions of inorganic and organic phosphorus increased significantly under 8 years continuous cropping of corn seed with 525 kg/(hm²·a) of chemical phosphorus fertilizer. The inorganic phosphorus amounted to 65.2%~70.2% of total phosphorus, while organic phosphorus accounted for 6.5%~11.4%. Ca₁₀-P > Ca₈-P > Al-P > Fe-P > O-P. MLO-P > HRO-P > MRO-P > LO-P. Ca₁₀-P reached to the highest at 5th year, and Al-P and O-P increased constantly in irrigated desert soil. Ca₁₀-P increased constantly while Al-P and O-P reached to the highest at 5th year in alluvial soil. The phosphorus increased by 3.94%~37.38%. Inorganic phosphorus declined from soil surface downward to a depth of 60 cm. The proportion of different fraction varied in different soil layers. Ca₁₀-P, O-P, Al-P and MRO-P was gathered in soil layer of 40-60 cm while Ca₂-P and HRO-P gathered in soil layer of 0-20 cm. The highest apparent efficiency of phosphorus fertilizer was 4.89% and phosphorus active coefficient was lower than 2% after 8 years continuous cropping. And the residual of exogenous phosphorus was 174.3 kg/(hm²·a) which means the lower conversion ratio of total phosphorus.[Conclusion] The movement of phosphorus was slow in two soils and accumulated with lower soluble fractions in surface soil layer with continuous cropping. The proportion of attachment and retention and the transportation of phosphorus by soil decreased constantly and possibly gathered toward bottom layer, which will cause high ecological risks on healthy development of ecological environment. Phosphorus fertilizer should be decreased or stop to use, also some suitable methods should be used for phosphorus utilization on alluvial soil.