Multi-sensor information fusion technology is a modern information processing technology, this technology has broad application prospects in the intelligent control system, In this paper, multi-sensor information fusion technology is applied to greenhouse detection system. This paper introduces the development of multi - sensor information fusion, analyzes the basic principles of information fusion, describes the process of multi - sensor information fusion, and the fusion method. According to the information fusion level, the fusion model of multi - sensor information fusion is expounded. And put forward the key problems in the process of data fusion.