Using the multi-field coupled analysis model with considering various thermal effects for the hot shear spinning of TA15 titanium alloy thin-walled shells, the deformation mechanism of thermal load conditions and mechanical load conditions have been elucidated. The results show that higher workpiece temperature and mandrel preheat temperature can bring about a smaller temperature gradient in the thickness direction, and the deviation ratio has a complicated effect on temperature difference of the deforming zone and a marked negative effect on the fittability. Moreover, the friction between workpiece and roller has a significant influence on the temperature difference. Increasing roller feed rate increases the temperature difference and decreases the fittability, which is opposite to that of the cold shear spinning, and a larger roller setting angle is favorable to the decrease of temperature difference and the improvement of the fittability.