A multi-mode, power-split hybrid transmission system comprising: an internal combustion engine outputting a driving force; a first electric motor outputting a driving force; a second electric motor outputting a driving force; a first planetary gear mechanism having a carrier, a ring gear, and a sun gear, the first planetary gear mechanism being operably coupled to at least one of the internal combustion engine, the first electric motor, and the second electric motor to transmit the driving force; a second planetary gear mechanism having a carrier, a ring gear, and a sun gear, the second planetary gear mechanism being operably coupled to at least one of the internal combustion engine, the first electric motor, and the second electric motor to transmit the driving force; a first dynamic clutch selectively coupling the first planetary gear mechanism to the second planetary gear mechanism; and a brake/clutch selectively coupling the ring gear of at least one of the first planetary gear mechanism and the second planetary gear mechanism, wherein the multi-mode, power-split hybrid transmission system is configurable to operate in a plurality of modes to transmit driving force to a final drive, and wherein the engine is operably coupled to the ring gear of the second planetary gear mechanism, the first electric motor is operably coupled to the sun gear of the first planetary gear mechanism, the second electric motor is operably coupled to the sun gear of the second planetary gear mechanism, wherein the first dynamic clutch collocates with the sun gear of the first planetary gear mechanism and the sun gear of the second planetary gear mechanism, the brake/clutch which is a third brake/clutch, collocates with the ring gear of the first planetary gear mechanism, and the carrier of the first planetary gear mechanism outputs to the final drive, characterized in that a second clutch element collocates with the carrier of the first planetary gear mechanism and the carrier gear of the second planetary gear mechanism. an internal combustion engine outputting a driving force; a first electric motor outputting a driving force; a second electric motor outputting a driving force; a first planetary gear mechanism having a carrier, a ring gear, and a sun gear, the first planetary gear mechanism being operably coupled to at least one of the internal combustion engine, the first electric motor, and the second electric motor to transmit the driving force; a second planetary gear mechanism having a carrier, a ring gear, and a sun gear, the second planetary gear mechanism being operably coupled to at least one of the internal combustion engine, the first electric motor, and the second electric motor to transmit the driving force; a first dynamic clutch selectively coupling the first planetary gear mechanism to the second planetary gear mechanism; and a brake/clutch selectively coupling the ring gear of at least one of the first planetary gear mechanism and the second planetary gear mechanism, wherein the multi-mode, power-split hybrid transmission system is configurable to operate in a plurality of modes to transmit driving force to a final drive, and wherein the engine is operably coupled to the ring gear of the second planetary gear mechanism, the first electric motor is operably coupled to the sun gear of the first planetary gear mechanism, the second electric motor is operably coupled to the sun gear of the second planetary gear mechanism, wherein the first dynamic clutch collocates with the sun gear of the first planetary gear mechanism and the sun gear of the second planetary gear mechanism, the brake/clutch which is a third brake/clutch, collocates with the ring gear of the first planetary gear mechanism, and the carrier of the first planetary gear mechanism outputs to the final drive, characterized in that a second clutch element collocates with the carrier of the first planetary gear mechanism and the carrier gear of the second planetary gear mechanism.