With the social transformation and the impact of various social thoughts, political identification meets an unprecedented challenge in China. However, it is an efficient method to improve political identification by promoting voluntary services. By analysing the figures from 505 award-winning voluntary service projects, results were found that volunteers had high political identification in total, and the level of unconstructive identification was higher than that of constructive identification; in voluntary conditions, with the increase of the number of participation, the figures for political identification rose dramatically, but the relationship was not simply linear, there's an identification inflection point; the level of political identification of males and Party members was higher than that of females and non-Party members; the level of political identification of constrained participators was significantly lower than that of people who participated voluntarily and were introduced by others, and the results were irrelevant to the involvement.