Energy saving is becoming one of the most important issues for the next generation of commercial vehicles. The fuel consumption limits for commercial vehicles in China have stepped into the third stage, which is a great challenge for heavy duty commercial vehicles. Hybrid technology provides a promising method to solve this problem, of which the dual motor coaxial series parallel configuration is one of the best options. Compared with P2 configuration, the powertrain can not only operate in pure electric or parallel mode, but also can operate in series, which shows better flexibility. In this paper, regulations on test cycle, fuel consumption test methods and its limits of the third stage will be introduced and explained in detail. Then, the quasi static models of the coaxial series parallel powertrain with/without gearbox under C-WTVC cycle are built. The control strategies, especially the modes partition principles and their boundary, are designed based on engine and motor performance. The fuel consumption of the configuration with different structures and control parameters are calculated by simulation to figure out the possible technology roadmap to meet the regulated fuel consumption limits. Sensitivity analysis is also conducted to indicate which structure parameter can reduce the fuel consumption in a most effective way. Results show that a 30 tons coaxial series parallel hybrid lorry with a four speed gearbox can realize fuel consumption of 26.1L/100km under C-WTVC cycle.