Abstract：Modeling analysis is a key step to study and design the gyro stabilized platform. A reasonable platform model is a big help for analyzing the error sources and designing appropriate control strategies. It provides the foundation for researching high-precision gyro stabilized platform. Based on the description of the platform's hardware and single-axis control structure, the error sources and coupling between axes are analyzed. Then, modeling and analysis methods are studied for non-linear friction, gyro drift, and mechanical resonance, the three main factors have influence on the precision, and the models for other parts of the platform are also discussed. Based on the above modeling analysis, an overall model which is comprehensive for decoupled single-axis control system is given. This model is consisting of four loops, namely, current loop, velocity loop, stability loop, and position loop. In this system, the LuGre friction model is chosen to characterize the non-linear friction. In addition, the characteristics of the control system are also illustrated. A reference for modeling analysis and designing error compensation strategy of gyro stabilized platform based on the modular modeling is provided.