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As drying the carriers can generally improve their mechanical strength, this study attempted a new preparation method of denitrified microbial agent. Its application is studied. The results show that the main factors affecting the treatment effect of immobilized microorganisms were: the amount of bacteria > PVA concentration > SA concentration > aluminum sulfate concentration. The experimental method for determining the immobilized microorganisms by the modified polyvinyl alkoxide method is as follows: in the embedding agent of 6.0% PVA and 0.6% SA, the entrained amount of 50 g/100 mL embedding agent is added to the centrifugal sludge. After stirring, it was added dropwise to a saturated boric acid and 0.6% aluminum sulfate fixing solution, fixed in a 4 ° C environment for 24 h and washed, and finally placed in a 30 °C blast drying oven. Dry for 3 h. The immobilized microbial technology of polyvinyl alcohol alkoxide drying method uses a low concentration embedding agent to improve the mass transfer performance and processing efficiency of the carrier. [ABSTRACT FROM AUTHOR]