In order to meet the monitoring needs of grain conditions, an embedded environmental monitoring system based on WinCE was introduced in detail in this paper. The hardware of the embedded environmental monitoring platform integrated a S3C2410 ARM microprocessor for grain signals processing. A four wire resistive touch screen was adopted as the input and output tools in this environmental monitoring equipment. Furthermore, Windows CE.net was selected as the embedded operating system of the slave computer terminals. The use of Windows CE.net emulator supported the debugging and simulation of the user application programs for environmental monitoring system. Finally, the experimental investigation results proved the stability and reliability of the environmental monitoring system.