Abstract: According to China's actual conditions, which mean comparatively poor economic conditions of farmers and the weak infrastructure in countryside, the data logger, with lower cost and better performance, has been developed in order to enhance the level of greenhouse production management and automation. The data logger, with the core of the EZ-USB singlechip computer which has USB interface and high performance, took the large memory flash chip as memory unit to save the environment data acquired from greenhouse, and took the serial A/D converter and keyboard input module as input key component to reduce the volume and cost, and took the liquid crystal as the display component. The USB host software was programmed using VC++, and an application example was designed. The data logger has a good performance-to-price ratio, small volume, portable and ease of use etc., therefore, it is worthy to spread the application.