文章从心理分析路径和工具性视角两个角度来研究微博使用对政治参与的影响。文章构建了三个评估指标体系:微博使用的工具性视角指标体系、网络政治参与的政治心理学因素指标体系和网络政治参与程度指标体系；并通过对大学生群体的问卷调查和数据分析，对三个指标体系中的各指标进行相关性分析。文章发现，政治心理各要素与网络政治参与程度多为正相关；微博使用各指标与网络政治参与程度的相关关系较为复杂，重度微博使用并不意味着高度政治参与，媒体接触过程中的心理因素更能影响政治参与。

This paper analyzed online political participation by instrumental and psychological approach, considering impact of micro-blog usage. The study constructed three evaluation index system about instrumental usage factors, political psychological factors and online political participation degree. By a survey on university students, the Pearson correlation analysis was conducted among the factors of above three index system. At last, the paper came up with the complexity of correlations between micro-blog usage and political participation, and the positive correlations between psychological factors and political participation. High-level usage of micro-blog does not means high-level political participation. Psychological factors in media contact play more important role in political participation.