The main reason for gear failure is the stress and surface strength of gear teeth.Therefore,in the field of research,minimizing the stress on gears and optimizing gear design have always been the topics of concerns.In this study,Solidworks software was used to design the gear system with specific parameters,and combined with structural steel materials,a detailed modal analysis of the helical gear assembly was carried out.The first 20 natural frequencies of the gear are calculated and analyzed by ANSYS software,and the vibration mode diagram of each order of frequency is obtained.The results show that the first-order modal frequency of the gear assembly is 216.47Hz,and the subsequent order results are relatively large.Therefore,only the first 6 to 8 orders need to be considered when analyzing the vibration modem diagram.These results can be used as a reference for the design of gear shaft,gearbox and gear frame.It helps to avoid resonance and reduce gear noise and vibration.