Abstract: 9-1, 1'-biphenyl-3-yl-3-(9, 9'-spirobi9H-fluoren-3-yl)-9H-carbazole is synthesized using the carbazole as raw material via the Ullmann, Bromination, Miyaura, and Suzuki reactions. The effects of different solvents, bases, and catalysts on the yields of the target product in the Suzuki reaction are extensively explored. The result of condition optimization experiment shows that when ethylene glycol dimethyl ether is used as the solvent, potassium phosphate as the base, dichlorodi-tert-butyl-(4-dimethylaminophenyl) phosphorus palladium(Ⅱ) as the catalyst, a yield of 97.1% is achieved. The structure of the target compound is characterized by ¹H NMR, ¹³C NMR, IR, and HRMS, and the thermal properties are studied by TG-DSC and UV-vis, respectively. The results show that the temperature of 5% mass loss of the target compound is 472.2 ℃, the glass transition temperature is 240.1 ℃, and the absorption enthalpy is 71.1 J/g, respectively, revealing a good thermal stability and high glass transition temperature.