Abstract: Developing solid bacterial agents with high mechanical strength, stable physical and chemical properties, and environmental friendliness is a key link in the application of biological enhancement technology. By enhancing the interfacial adhesion with sodium silicate,optimizing the pore structure with soluble starch, and combining with thermal modification treatment, the stability and adsorption performance of the immobilized carrier based on attapulgite have been significantly improved. The self-screened mixed bacterial agents were immobilized on the surface of attapulgite-based carriers by the adsorption method to prepare mixed solid bacterial agents with excellent performance. The results show that when the ratio of attapulgite: sodium silicate: starch is 100 g∶9 g∶10 g and calcined at 450 ℃ for 1 h, the carrier loss rate can be below 3%. When the particle size of the immobilized carrier is 100 mesh and the immobilization time is 24 h, the viable bacteria count loaded in the bacterial agent can reach 46.38×10⁹ CFU·g⁻¹, and the degradation effect on pollutants is good. The research results of this experiment can provide technical references for using attapulgite as an immobilized carrier.