中文摘要：

以中国沪、深两市1999～2012年上市公司为研究对象，研究了董事会规模如何影响企业风险承担以及产权性质和市场化进程对上述关系的调节作用。研究表明：规模较大的董事会对极端决策更难达成一致，倾向于选择风险相对较小的项目，董事会规模与企业风险承担显著负相关。与非国有控股公司相比，国有控股公司董事会的决策权力有限，其董事会规模对企业风险承担的负向影响也相对较小。市场化进程的改善能够增强董事会成员对企业风险承担价值的认识，降低群体决策的沟通与协调成本，便于董事会成员对企业风险承担决策达成一致，进而减弱董事会规模对企业风险承担的负向影响。

英文摘要：

By using listed companies over the period of 1999 -2012 in Shanghai and Shenzhen stock exchanges as samples, this paper studies the relationship between board size and corpo- risk - taking Compared with non -state holding companies, due to the limited decision -making power in state holding companies, the negative impact of board size on corporate risk - taking in state holding companies is relatively smaller. The improvement of marketization process can en- hance the understanding of board members on the value of corporate risk - taking, and reduce the cost of communication and coordination of board members in group decision - making, which help board members to reach an agreement on corporate risk - taking decisions, and thus weakening the negative impact of board size on corporate risk - taking.