<p>Hybrid ceramic spherical roller bearings (HCSRB) offer superior performance in demanding environments by replacing traditional steel rollers with ceramic ones, capitalizing on their low friction, high temperature resistance, and excellent wear and corrosion properties. However, differences in material behavior between steel and ceramics necessitate a dedicated design approach. Directly applying steel bearing parameters to hybrid ceramic designs can lead to excessive contact stresses, limiting fatigue life and negating material advantages. Therefore, in this study, with the purpose of improving the fatigue life and bearing capacity of HCSRB, the 22317E main bearing in the rotor system of the UAV is selected as the research object, and a multi-objective mathematical optimisation model with the rated dynamic load (<i>C</i>_<i>d</i>) and friction power consumption (<i>M</i>) as the objectives is established, and the numerical iteration solving of the optimisation model is carried out based on the NSGA-II algorithm, and a convergence analysis is carried out to obtain the Pareto optimal solution set. The optimal structural parameters of the HCSRB were determined. And the contact mechanics model of spherical roller bearing is established based on non-Hertz contact theory to show the effect of the optimised design on the contact stress of HCSRB. The results show that the rated dynamic load of the bearing increases by 14.77 % and the friction moment M decreases by 15.66 % compared with that before optimisation, and the maximum contact stress at the roller edge decreases by 37.06 %. Reduced roller edge stress concentration phenomenon, improved bearing capacity, proved the effectiveness of the optimisation model. Finally, a sensitivity analysis is conducted to identify the sensitivity of objective functions with design variables. The sensitivity analysis plays an important part in deciding the tolerances, which can be provided to design variables for the manufacturing of ceramic spherical roller.</p>