Abstract: With the growth of age, the body condition is constantly changing. After entering the old age stage, the functions of the body are significantly weakened, unable to complete some regular actions normally. When using some conventional tools, it is necessary to use some devices with auxiliary functions to achieve better results. By the study of the physical parameters and muscle strength changes of the elderly, this paper determined the functional and objective requirement of the elderly for the auxiliary seat on the basis of in-depth research. The basic model of the auxiliary seat is established according to the functional requirement. Jack software is used to analyze the ergonomic simulation of the elderly auxiliary seat. Based on the objective requirement of the elderly, the comfort, visual field, forcesolver and reachability is analyzed. The results show that the ergonomic performance of the auxiliary seat is relatively good, but some aspects need to be improved.

Key words: older people, auxiliary seat, ergonomics, requirement, virtual simulation, Jack