an engine driving mode of three transmission ratios for improving fuel efficiency under a high speed cruising condition further the power train provides functions suitable for plug in hybrid vehicles or fuel cell vehicles that is providing a plurality of shift stages in the ev modes will allow the motor to be driven with high efficiency since these vehicles have longer traveling distance in an electric vehicle mode further as in the ev 1 u2032 mode since two motor generators provide a high torque under drive transmission ratio where they all operate as motors it is possible to satisfy when a driver needs high level of acceleration meanwhile as described above since the present invention can provide traveling modes of four ev modes two hev modes and three eng modes using two planetary gear sets and maximum five clutch brake members as compared with other power trains in the related art the present invention reduces the cost and the weight by reducing the number of parts and has a technical advantage in terms of mounting characteristic in a vehicle power performance and fuel efficiency the foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes.