Abstract: Over the past few years, the Mainland China has been frequently attacked by extensive and severe air pollution. Smog in the country has turned out to be a problem with highly public concern. As a result, smog and its impact has become a new and hot research field in China. Due to the combined negative impacts of multi-factors, smog problem in Beijing is quite serious and gets particularly much attention at home and abroad owing to its special position as the capital city of China. It is well known that Beijing is a very influential tourist generating city as well as a worldly famous tourist destination. In the light of this, there are some essential issues worth studying, such as what are local people’s perceptions of smog? What are the impacts of smog on tourism demand and decision-making behavior tendency of local people in Beijing. However, these questions are well addressed. In this article, the authors have made a questionnaire survey in the early 2016 on the perception of Beijing residents and their tourism demand and decision-making behavior tendency under the impact of smog by utilizing the online questionnaire design and spreading platform of “sojump.com” and spreading them on WeChat (a Chinese social media like Facebook). It is found in this research that: 1) the majority of Beijing residents have agreed smog problem in Beijing is very serious with strong perception of its negative impacts on physical health, emotional mood, and daily life; 2) Beijing residents have strong desire to escape from the city due to constant suffering from smog, which stimulates and increases more tourism demand of local people; 3) there is a significant statistic difference in Beijing residents’ perception and attitude of smog among different demographic groups, and young and middle-aged local people working in institutions and enterprise units with high income and education level have apparently stronger perception and attitude of smog. In the end, the authors have discussed the marketing meaning of the above findings.