This paper presents urban parks as the last remnant of natural landscapes in urbanized areas to be the recreational service of wetlands as green spaces. Although the proportion of green spaces was found to decrease with the increasing urbanization, as the major part of green spaces, urban parks can provide ecological, economic, social, and cultural services for human, and make up of public recreational areas for modern-life styles. In urban parks, water landscapes were important for the recreational service due to their direct use for residents. This study analyzed the effects of social-demographic factors on the recreational services of 20 urban parks in Beijing by questionnaires. Descriptive statistical methods were used to investigate the use of urban parks wetlands, and logistic regression analysis was used to identify effects of socio-demographic factors on use of urban parks wetlands. The results show that: (1) the travel time of respondents to a park was correlated to frequency of visits. About 43.4% of the respondents live in the areas with 1 hour travel, among which 34.1% of the respondents visit the park wetlands more than 12 times every year. On the other hand, only 17.4% of the respondents visit urban parks wetlands more than 12 times every year, 85% of the respondents have accessibility less than 1 hour travel. (2) The importance of socio-demographic factors on the preference of local people to urban park decreases from travel time, income per capita, private car, education level, occupation, and age. Travel time is the most important factor to affect the use frequency of parks wetlands in Beijing. Gender and accommodation types were not significantly correlated to the frequency of use of parks wetlands in Beijing. However, the integrative effect of gender and age was obvious. (3) Most respondents visit urban parks for relax, and then getting knowledge, physical exercise, and social exchange. This study may help decision-makers and urban planners on optimization and management of urban parks.