Abstract: Nintendo Wii is one of current most popular indoor recreational activities. The birth of Wii brought with it a new form of game machine that has had a major impact on the world of information technology industry. Because it combines the characteristics of recreation, leisure and interaction, the customer can both pursue exercise and experience virtual reality simultaneously. Wii need to connect to TV screen and also need a large room to play, so most of families put it in the living room. However, every family’s living room size and the TV screen size are quite different. Therefore, this study aimed to evaluate the effect of screen size and viewing distance on game performance and subjective rating and providing the user with a reference for choosing proper screen. This research adopts three different size screens and three different viewing distances to simulate all activities. Fifty participants are recruited to play the Wii. Each individual's score and subjective rating are recorded with consideration of the influence of gender and age. By the experimental results, it is found that both screen size and viewing distance are the factors affecting game performance. Bigger screen and farther viewing distance lead to higher game performance and subjective ratings, but the participant's fundamental data, such as age, gender, experience, frequency and response ability, have no any influences on game performance.