Series hybrid electric systems for track-type dozers (TTD) have been applied now. This paper provides a new type of design with multi-modes based on two-planetary gear sets. The track on each side can be controlled independently, which can realize central steering and precise control. A systematic methodology is developed to screen out optimal designs which can ensure the driving attributes such as steering and going backwards. The fuel economy of the feasible designs is then compared with the series hybrid TTD under typical conditions using optimal control. The results show that hybrid systems with planetary gear sets have developmental potential for TTD, which can be used for future application.