The heading sensitive drift of inertial platform system changes with the degradation of components’ performance and the coupling characteristics under long-term storage conditions. Such heading sensitive drift is different from the drift under working conditions, and it is difficult to analyze its stability for allocating resources for the calibration and maintenance in engineering application. In this paper, firstly the theory and expression of heading sensitive drift caused by servo loop zero and structure disturbing torque was presented and derived. Secondly, the drift characteristic of influence parameters was analyzed thoroughly based on the expression, and the integrated behavioral model of heading sensitive drift under servo loop zero and disturbing torque influence was concluded. And then, the long-time drift characteristic, acceleration performance and stability of heading sensitive drift behavior were analyzed with actual storage condition profile. The results indicate that heading sensitive drift on the X, Y and Z axis has the similar long-term drift characteristics without acceleration response, which is different from the response characteristic in actual use and therefore has great significance for allocating resources for the calibration and maintenance in inertial platform system.