It is the requirements of limited resources and realtime in embedded system. Design of network communication system based on embedded system is hard. In this paper, we propose the architecture of embedded network using Modbus TCP/IP protocol, analyze the composition of Modbus TCP/IP protocol. It is that Modbus protocol information can be made in the TCP/IP protocol of the Internet transmission, and thus extend the application of Modbus protocol. The network communication system is designed and implemented on the ARM platform using non-blanking socket in Linux. The system is available, stable and worthy of popularization.