股权分置下的上市公司存在着股权结构不合理,缺乏共同的利益基础,内部人控制严重,缺乏有效外部治理等问题;股权分置改革对公司产生的深远的影响,形成共同利益基础,优化股权结构与健全公司治理机制、活跃控制权市场等。研究结论表明股权分置改革后我国上市公司的经营绩效总体上有明显的改善。 Equity structure of listed companies under the existence of the ownership structure is irrational, the lack of a common basis of interests, the internal control of serious lack of effective external governance and other issues; split share structure reform has far-reaching impact on the company, the formation of common interests, optimization Ownership structure and sound corporate governance mechanism, an active control of the market. The conclusion of the research shows that after the share-trading reform, the performance of listed companies in our country has obviously improved obviously.