In order to establish a lightweight, portable and integrated individual soldier navigation system, discusses based on functional architecture of the individual soldier navigation system. This paper analyzes the applicability and feasibility of the integration of Android intelligent terminal and foot MEMS to establish an individual soldier navigation system, studies the use of Android GNSS data acquisition and high-precision positioning processing, integrates Android GNSS with foot MEMS, and enables 5G communication at the same time. The results show that the architecture realizes the method of indoor and outdoor high-precision positioning of individual soldier, and provides a reference for the construction of individual soldier navigation system.