In the battlefields of the information age, the flatting and networking organizations are the primary mode of the military organizations for network centric warfare. To explore the methodology of designing the mode of the military force, the model of PCANS is used to characterize the military organization in the traditional battlefields, on which its shortages are analyzed for organizations in the information age. Importing the information into PCANS, We advance a new approach to describe the organizations. And the essence, objective and methodology of designing the organization are presented on the organizational description in the information age.