In order to clarify the effect of microbial agents on improving the environment of garlic producing area and improving the yield and quality ofgarlic，conventional fertilization combined with Bacillus amyloliquefaciens W48 fermentation broth was used to treat the soil in garlic field. The yield and quality related indexes of garlic weremeasured，andthe changes of soil physical and chemical properties and biotransformation related enzymes were monitored. The content of phthalate esterplasticizers(PAEs)in soil and garlic treated with microbial agents was quantitatively analyzed. The results showed that W48 strain has the ability to secrete indoleaceticacid，as well as the potential to dissolve phosphorus and produce iron carriers. The application of W48 microbial agent significantly increased the contentsof organicmatter，alkali -hydrolyzed nitrogen，available phosphorus and available potassium in the rhizospheresoil，improved the trophic environmentin therhizosphere，increased the activitiesof soil alkalinephosphatase，sucrase andurease，and improved soil nitrogen and phosphorus use efficiency. Compared with thecontrol，the garlic plots treated with microbial agents increased theyield by10%，and the content of soluble sugar and vitamin C wereimproved，among which the soluble sugar increased by 30%. Di-n-butyl phthalate(DBP)and di -2-ethyl hexyl phthalate(DEHP)were the main types of PAEs detected in soil andgarlic，with the average concentration of 1874.05and 337.12 μg/kg，respectively. The residual amount of PAEs in garlic was generally high. The highest DBP was666.57 μg/kg，followed by diisobutyl phthalate(DIBP)which was 409.93 μg/kgand butyl benzyl phthalate(BBP)which was433.65 μg/kg. W48 exhibited significant PAEs degradation ability invitro，andthe bacterial agent treatment could significantly reduce the concentration of PAEs insoil，but had no significant effect on the content of PAEs in garlic. Theremoval rates of DBP，DEHP and dimethyl phthalate(DMP) were25.5%，76.1% and48.4%， respectively. The results of this study can provide technical support for remediation and improvement of soil pollutants in garlic producing area.