In order to serve coaching and combat readiness in the new situations, in recent years, our Army has been invested and equipped with many innovative and modern weapons and armaments. Many types of them are placed on military vehicles which have peculiar sizes, loads and dynamic characteristics. Therefore, military ways whould have been designed separate geometric elements, especially in the difficult conditions: craggy terrain conditions, or on military routes that are quickly built without pavement. In this article, the authors studied the theoretical basis and applied it to build dynamic factor diagrams of some special military vehicles by analytically method as a basis of offering the maximum longitudinal grade for specific military roads of the Vietnam People’s Army.