中文摘要：

信息技术（系统）既可以减少企业内部的协调成本和生产成本,又可以减少企业与市场之间的协调成本,因此信息技术（系统）对企业规模的影响存在两种效果。通过收集沪深76家上市公司大约400个样本观察值组成的非平衡面板数据,本文在我国背景下实证检验了信息系统与企业规模（以员工总数和资产总值来衡量）的关系,实证研究发现,使用信息系统后,上市公司的规模在统计上显著减小了。本文还对ERP与企业规模的关系进行了实证检验,研究发现使用ERP后,上市公司的规模在统计上显著减小了。

英文摘要：

Information technology （systems） can reduce firm internal coordinate and production cost, also can reduce coordinate cost between firm and market. Therefore, there exists positive and negative influence as for the impact of information technology （systems） on firm boundary. By collecting 76 Chinese listed companies about 400 samples of observations data, this paper empirically studies the relationship between information systems and firm size under Chinese context. This study draws the following conclusions： those listed companies＇ size （which is measured by employees and total asset） is statistically and significantly negative associated with information systems adoption. This paper also empirically tests the relationship between ERP and firm size, we found that firm size is statistically and significantly negative associated with ERP （Enterprise Resource Planning） adoption.