With the application of stealth technology and the development of multimode detection technology, the photoelectric countermeasure of single frequency band cannot meet the increasingly complicated demand of modern warfare, and the technology of stealth, detection and recognition must be based on the development of multispectral testing technology. Based on the threat analysis of ground weaponry, this paper analyzes the current situation of multispectral testing and data fusion processing technology with the most widely used radar and infrared target characteristics test ,and proposes some suggestions for development.