The VII-HPC power platform with the balance rocker suspension, variable ground clearance and variable wheel track was designed to meet special needs in the hilly regions. Variations of ground clearance, wheel track, and attitude of the VII-HPC power platform were studied by employing traditional approaches. The formula, boundary conditions and the corresponding curves on centroid height changing trends, sideslip and rollover, longitudinal slip and turning were summarized. Its stability was verified better than the ordinary tractor by simulation analysis.