A transferrable arithmetic of the position-disturbing value for a stable platform was proposed on the basis of the detailed study of the stable principle of the dynamic platform and its configuration characteristics . The principle of the transferrable arithmetic is as fellows: the coherence is built between the middle inertia and the platform firstly, and then the relation conversion matrix is established between the vehicular inertia and the middle inertia. The value of the middle inertia is deduced by the conversion matrix and vehicular inertia. By above, the middle inertia can be replaced with a “fictitious inertia” constructed by the relation conversion matrix and the vehicular inertia. This “fictitious inertia” value is the position-disturbing value of the dynamic platform. Experimental results show that this transferrable arithmetic has high precision, and its max error is 0.0561°. The dynamic platform stabilization is realized by this arithmetic with the ready inertia on the basis of the unadjusted vehicular inertia. It has advantages not only the work efficiency but also the performance-price ratio. The method has been already successfully used in several vehicular dynamic platforms.