本文阐述了嵌入式Ethernet 结构的特点，设计了一种新的网络测试系统。该系统包括嵌入式Ethernet 控制板的开发以及外围电路的网络拓扑结构，它提供了一个网络测试环境，能够更快速、多任务地实现数据采集的传输和处理，该系统已经在空调生产检测上得到了很好的应用。关键词：嵌入式系统 Ethernet mClinux 检测Abstract: Principles and properties of embedded Ethernet are introduced in this article.In addition, a new kind of automatic network test system has been designed. Thesystem is composed of embedded Ethernet control board and NCB framework, for whichdata transfer and process has been come true multitasking and more fast . Because ofincreasing in test efficiency greatly, it has been put into action well in air-conditionproducing test.Key words: embedded system, Ethernet, mClinux ,test