This research is based on widely used technology acceptance model, focusing on wearable devices applied to smart watch for senior citizens healthcare, to identify the key factors on purchasing which could be a reference for relevant companies working on wearable devices research and development. The result suggests that convenience should be highly emphasized on the research and development of healthcare smart watches. Integrating with remote healthcare resources and human machine interface, which is easy to operate for the senior citizens. The results not only make the users feel the product valuable, useful and convenient, but also provide substantial help for senior citizens healthcare.