Stroke is the main cause of long-term disability in adults. Stroke patients often experience partial paralysis, which can make independent living difficult or impossible. Rehabilitation training has proved to be an effective way to restore the exercise capacity of stroke patients. With the aging of the global population, more and more people need rehabilitation training after stroke. However, the number of therapists, doctors, and nurses required for post-stroke rehabilitation training is far from enough.

So that the application of robot devices to assist rehabilitation therapy has become a trend. The robot-aided rehabilitation can not only replace the medical staff to provide patients with a large number, high-intensity and continuous training, but also often combined with games, which can improve patients' interest in training and ensure the quality of rehabilitation training.

However, the abandonment rate of this equipment is high.It is generally believed that the reason for this failure is the lack of key user participation and lack of testing with user during the development process.

In order to make these new technologies better application and rehabilitation training, the design must meet the user's needs. So there is a question that needs to be answered at first: „Who are the end-users of the system and what specifically do they need?” In other words, User Centered Design is needed. It includes many design methods and tools, such as persona, user journey map, focus group, etc., which will help designers better understand user pain points and requirements.

In this project a new interaction system to ensure user experience when using the robot-aided rehabilitation is developed. The main point is to adopt a user-centered design method to simplify the therapist’s work as much as possible and increase user's interest of using robot-aided rehabilitation. In the discuss of the user-centered design of game-based robot-aided rehabilitation system, mechanical robotic parts, system functions, training games, and computer interfaces are considered.