To investigate the effects of different phosphorus rates on the variations of Mn, Al, Mg and Ca concentrations in soil solutions and wheat responses to phosphorus in acid red soil, a pot experiment with a non-destructive soil-solution sampler preinstalled were conducted with increasing phosphorus fertilizer levels from 0 to 800 mg/kg. The results showed that pH was increased while the concentrations of Mn, Al, Mg and Ca in soil solutions were significance lower amended with CaCO₃ than without CaCO₃. Compared to 0 mg/kg phosphorus treatment the concentrations of Al, Mn, Mg and Ca at least decreased 47%, 44%, 37% and 33% after 800 mg/kg phosphorus treatment no matter amended with CaCO₃ or not. Wheat biomass was accumulated highest in 200 mg/kg phosphorus treatment then decreased as phosphorus rates increased. However, the root biomass trended to decline as phosphorus rate increased while the soil was amended with CaCO₃. Those results indicated that CaCO₃ could increase pH and decrease Mn, Al and Mg concentrations in soil solution. At the same time, phosphorus could alleviate Mn and Al toxicities in acid red soils while decrease Mn and Al concentrations in soil solution. 200 mg/kg phosphorus fertilizer was suitable for wheat growth in acid red soil.