Abstract: In view of the environmental damage caused by mining, two new composite materials were prepared using hydroxyapatite (HAP) modified corn straw biochar (CSB) and chicken manure biochar (CMB) to repair copper sulfide acid soil. The experimental results showed that after 2 months of planting alfalfa, the pH value of acid soil increased to a certain extent, and the maximum was 27.5%. The composite material not only significantly reduced the content and bioavailability of Cu in soil, but also reduced the upward transport capacity of Cu in the plant-soil system. Composites can reduce the content of available Cu in acidic soil to different degrees, and the two groups with the best effect are CSB-2 and CMB-2, which decrease by 31.83% and 29.38%, respectively. The correlation analysis results showed that reducing Cu content in soil should increase pH value, EC and CEC in soil. This study shows that biocarbon-bound HAP is a good candidate material for the remediation of copper sulfide acid soil, and it can be a new way to repair copper sulfide acid soil.