In this study, peach shell and pig manure biochar were modified by phosphoric acid and potassium hydroxide. SEM, bet, FTIR, XRD experiments were carried out to study the characterization changes, and the dry wet cycle was carried out to study the water retention and crack inhibition ability of biochar soil mixture with different parameters. It was found that the modified biochar had a larger pore structure, which significantly enhanced the water holding capacity of the soil and effectively inhibited the crack propagation. The amount of mixture in different modified biochar and soil samples has an effect on crack depression and water holding capacity. After that, it will be introduced in detail.<br>
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