As a new combat force， the army synthetic brigade has many types of equipment， high degree of integration， and complex support problems. It has higher and higher requirements for "accurate support" of equipment. The digital twin technology is introduced into the field of equipment support. Through the analysis of the research object， the connotation and extension of the research system are outlined， and the operation law of the system is mastered. By constructing the framework of digital twin model， the structure of the digital twin model is described from the five dimensions of physical dimension， twin dimension， data dimension， application dimension and connection dimension， the key technologies for the establishment of each dimension of the model are clarified， the application assumption of the model is explored， and finally the digital twin model of the typical equipment support system of the army synthetic brigade is constructed to solve the complex problems faced by the equipment support of the army synthetic brigade. It provides a method reference for the realization of the goal of "accurate support" of equipment.