In the modern war,whether it is the air attack weapon of manned and unmanned cooperative operation,or the guidance weapon carried by UAV,it always poses a serious air threat to the important military targets and armed forces of the belligerents. With the improvement of the performance of its precision guidance weapon,the change of attack style and campaign tactics,the air defense weapon system based on the land area can detect,search and control tracking and fighting related manned and unmanned air attack weapons encounter great obstacles.We must strengthen and pay attention to the land defense system based on laser infrared guided weapons. Precision guided weapons,such as laser guidance,TV/IR imaging guidance,radar guidance and composite guidance,have become the main targets and typical scenarios of land defense system. Firstly,this paper analyzes the characteristics of land war under the rapid evolution of war form. In response to the challenges posed to land defense by foreign military precision guided weapon development programs and technological improvements,this paper constructs the concept of land defense system based on laser infrared guided weapons under the new combat form,and introduces the basic composition,function and operational process of the system,to provide theoretical support and reference for the construction and development of related defense system.