In order to adapt to complex environment and unstructured terrain, a dynamic chassis of tracked vehicle with dual power flow differential steering and balanced rocker arm is proposed. The tracked vehicle can meet the design requirements of adjusting ground clearance, adaptive road surface, obstacle crossing, flexible attitude adjustment, stable attitude maintenance and wheel-shoe combination. The overall configuration scheme of tracked vehicle with differential steering mechanism is determined. The driving model is established according to the balance of driving force and driving resistance, and the power model required for climbing is established according to the climbing angle and speed of tracked vehicle. On this basis, the relationship between the maximum power of driving motor and the maximum gradient and the speed of climbing is determined. The power of linear traveling motor, steering traveling motor and swing arm adjusting motor of tracked vehicle are analyzed and calculated. The steering resistance moment of the inner and outer tracks during steering are deduced, and the total steering resistance moment of the vehicle to the center of mass is determined. The research results can provide theoretical basis and research means for the prototype development and test of tracked vehicles.