Abstract: [Objective] The project aims to study the effect of different ratios of acidic materials (ammonium sulfate and urea phosphate) applied to calcareous soil through drip irrigation on soil pH and P availability maize plant growth and P uptake.[Method][Result]The results showed that different ratios of acidic materials under drip irrigation decreased the regional soil pH significantly, and acidification effect tended to rise with the increase of the acidulant application, and in the sixth application, it reached the peak.The largest decrease of soil pH was 0.35.And different ratios of acidic materials significantly increased available P content.Under the uniform nutrient inputs and management level, the results showed that application of different of ratios of acidic materials improved maize biomass and increased P accumulation of plant.P accumulation of different ratios of acidic materials was increased by 29.86;,15.06; and 11.52; respectively compared with CK, and maize yield increased 7.72;-10.58;.[Conclusion]Applying different ratios of acidic materials can improve nutrient availability and crop yield in calcareous soil and it is an effective method.