Objective This study aimed at screening high-efficiency phosphate-solubilizing bacteria from rhizosphere soil to address the accumulation of insoluble inorganic and organic phosphorus in soil， while identifying strains with potential plant growth-promoting properties.Method The strain L17 was isolated and screened using Pikovskayas Medium， followed by systematic identification based on morphological characteristics， physiological and biochemical properties， and 16S rDNA gene analysis. The phosphate-solubilizing ability was determined by the molybdenum-antimony anti-colorimetric method， potassium-releasing ability by flame atomic absorption spectrometry， nitrogen-fixing ability by alkaline persulfate digestion， and indole-3-acetic acid （IAA） secretion by the Salkowski colorimetric method.Result The experimental results showed that strain L17 belongs to the genus Bacillus （Bacillus sp.）. Its phosphate-solubilizing ability was （78.436±0.224） μg/mL， potassium-releasing ability was （58.900±2.390） μg/mL， nitrogen-fixing ability was （106.610±4.580） μg/mL， and IAA secretion reached （71.711±1.812） μg/mL.Conclusion Strain L17 exhibits significant phosphate-solubilizing， potassium-releasing， nitrogen-fixing， and IAA-secreting abilities， demonstrating strong potential for promoting plant growth. It provides important support for the development of soil remediation microbial agents and research on biodegradation agents for environmental pollution.