以中国沪、深两市上市公司为研究对象,实证分析中国上市公司内、外部治理机制与多元化经营和价值效应之间的关系。结果表明,董事会特别是公司董事长和总经理两职合一以及独立董事比例是影响公司多元化经营决策的重要内部治理机制变量,外部治理机制对公司的多元化经营决策没有显著影响;多元化经营会导致价值溢价,但这种溢价不显著;内部治理机制中的资产负债率、外部治理机制中的审计意见和产品市场竞争程度是影响多元化经营公司业绩的重要因素,第一大股东的实际控制人身份、审计意见和产品市场竞争程度会显著影响专业化经营公司的经营业绩、
Using the data of Chinese listed firms, this paper investigates the relationship among various internal and external corporate governance mechanisms, corporate diversification and firm performance. The paper finds that, the boards of directors, especially the CEO duality and independent directors have important effect on the corporate diversification, but external governance mechanism hasn't significantly effect on the firm diversification. In the diversified firms, assets liability ratio and audit outcome and product market compelilive extent have important effect on the firm performance, but in the specialized firms, actual controlling shareholder, audit outcome and product market competitive extent affect the firu's performance.