Head tracking technique plays an important role in the modern war. Because it is directly related to target capture rate. To adapt to rapid attitude position of the helmet, a novel real-time head tracking technology based on Micro-Electro-Mechanical Systems inertial navigation system (MEMS-INS) and Charge Coupled Device (CCD) is put forward. This method not only considers the spatial limitations of the helmet, but also takes into account the complementarity between inertial method and optical method. Firstly, the fundamental principle of head attitude measurement based on MEMS-INS/CCD is introduced. The state space model of the helmet attitude measurement is then built. In the end, feasibility of this method is validated by simulation. Simulation results show that head misalignment angle error can be estimated and reaches anticipated precision2 in 10 seconds. The helmet real-time tracking can be completed.