With the rapid development of nation's economy, the grain storage increases more and more, the large grain snags construction to grain temperatures, China sway technology which put forward more and more requests. In this paper,a new scheme of temperature detection system for grain storage based on wireless sensors network was proposed to overcome the disadvantages of the traditional measuring methods. And the hardware configuration and software design of the temperature sensor node are introduced in detail. Experiment results show that the design scheme has good steadiness, high measure precision and its installation is simple and convenient.