The hemispherical resonator gyro (HRG) is a new kind of vibratory gyro, which has a wide application prospect in the field of equipment. The fast start performance of HRG is affected by the manufacturing error, interference source and working environment. In this paper, the influencing factors of the output of HRG are analyzed, and the effects of Q value characteristics, assembly, and temperature and signal interference on the fast start performance are discussed. The fabrication and signal process of the sensitive devices are optimized and improved. The results show that the optimized and improved HRG can be stabilized within 3 minutes after power on, which is a significant improvement compared to more than 1 hour before the improvement.