Abstract: Energy Internet is a kind of energy sharing system based on smart grids and renewable energy.As a key equipment of Energy Internet,the energy router（ER）controlled by information flows can better realize the efficient and optimal transmission of electricity generated by renewable energy.Therefore,the main structure,functions and design requirements of existing ERs are reviewed.Besides,the optimal selection of transmission routing is considered after the ER is introduced into Energy Internet.With the opening of power markets,the distributed energy is involved in power market transactions,which makes the energy flow flexibly and bi-directionally in Energy Internet.It is hard for conventional power dispatch method to distinguish the source and specific direction of power flows,and it is not guaranteed that the power is transmitted by contract path.Therefore,a minimum loss routing algorithm based on matchmaking tradeoff competition mechanism is put forward and applied to the future Energy Internet.Among those,the power quality difference,the asynchrony and real-time of power transmission are considered.Meanwhile,the congestion management is directly taken into consideration in the optimization algorithm.Finally,the effectiveness of the proposed optimization algorithm is verified by simulations.