中文摘要：

本文从生态学视角出发，将研究焦点深入到上市公司内部的股东层面。通过将上市公司股东进行生态学的种群划分，刻画不同类型股东所处的生态位，研究分析不同生态位的股东群体之间的关系和行为表现。基于国泰安数据库和CCER数据库2643家上市公司股东2008-2014年四个季度约60万条记录数据，将决策树算法用于股东统计分类和行为分析上，尝试了一种具有速度快、精确度高的特点的统计分析方法；通过分析发现股东持股排名的生态位维度对股东增减持行为和程度影响最大，为进一步的治理决策提供了依据。

英文摘要：

From ecological perspective, this paper will focus into the internal shareholders of listed companies. By dividing the different populations of the shareholders in listed companies, and depicting the niches of different types of shareholder, the paper anMysis the different relationships and behaviors of shareholder populations from different niches. Based on about 600000 shareholder records of 2643 listed companies which loaded from the Guotaian Database and CCER Database, the paper applies the decision tree method in statistical classification and behavior analysis of shareholders, experiments a statistical analysis technique which results a faster and more accurate than the common methods. Through the experiments, gets the conclusion that shareholder rank in shareholder niche dimension is the most important thing that affects the reducing or increasing behavior of shareholders, builds the foundation of governance and decision accordingly.