Abstract: Objective To investigate the habit, demand and self-assessment of health of some participants and provide evidence for policy decision. Methods Two parks and four communities were selected randomly. Group exercise participants were interviewed face to face with anonymous questionnaire in April 2015. Results Totally 222 participants were interviewed. The proportion of male was low (17.6%).Comparing to health condition before taking part in group exercise, most participants felt more energetic(82.9%), better mood(76.6%), better sleep (65.3%),having more friends (52.7%),less hospital visits(50.5%) and the mean of BMI declined from 24.6 kg/m² to 23.8 kg/m²(t=7.6, P<0.001). After joining group exercise, the proportion of overweight declined from previous 39.6% to current 33.3% (χ²=1.9, P=0.168) and the proportion of obese declined from 13.5% to 7.7% (χ²=4.0, P=0.045).64.9% participants stuck to exercise in smog day. Some other bad habits still existed such as exercise on an empty stomach (20.7%), wearing high heels (13.5%) and skin-tight pants (14.4%). 21.2% participants in parks and 53.0% participants in communities thought exercise space was not enough. Conclusions Group exercise had a positive impact to participants' physical and mental health. Governments should advocate group exercise and encourage more men to participate such exercise. The government should organize experts to provide professional instruction for participants so they can fully benefit from such exercise.