Abstract: In order to explore the dissolving effect of biomass on phosphate rock powder, steam explosion was used to release organic acid from corn stalk(CS) to dissolve phosphate rock powder(PRP) under high temperature and hydrothermal conditions, at the same time, phosphorus-containing humic acid was prepared. The process of dissolving phosphate rock powder by steam exploded corn stalk(SECS) was explored and the optimal conditions were determined. The structures and properties were investigated by Fourier transform infrared spectroscopy(FT-IR), scanning electron microscopy(SEM) and X-ray fluorescence spectroscopy(XRF). The results showed that under the conditions of temperature 170℃, 15 g steam exploded corn stalk, 1 g phosphate rock powder, 75 mL water, adding 10% calcium chloride, reaction for 3 h, the amount of dissolved phosphorus was 1.46 mg/g(based on the mass of stalk). The addition of sodium bisulfate could lower the pH value of the system to below 2, and the amount of dissolved phosphorus could reach 13.26 mg/g. Under high temperature and hydrothermal conditions, partial humification of stalks could be directly used as fertilizer. After adding 0.2% humic acid, the plant height, root length, chlorophyll content and relative conductivity of wheat were significantly higher than those of the control group.