In China, there is a tradition of using the park with variable activities by inhabitants in early morning, and we found that it was an important opportunity of social communication, by the investigation of the users activity in Huangpu-park, in 2005.
In 2008, we did another investigation through questionnaire, observations and deep interviews with the users. By the survey of social background and the comparison of the results of two investigations, we clarify the following facts:
1. According to the transitions of main groups, we found four turning points of the users activity in recent years.
2. There are four types of user group, and the type of each group may changes to another by the influence of the passage of time.
3. The composition of user groups and the conscious of most users, such as the purpose of activity and the relationship in group, have changed.
4. There seems to be a correspondence between the type of user-group and the social property of the area they use.

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