Abstract: The spinning electron transport for the spin polarization induced by local Rashba spin-orbit coupling in a three-terminal parallel double-quantum-dot structure is theoretically studied by the nonequilibrium Green function method. It was found that when the electrons come from the source terminal to two drain terminals through quantum dot region, they can select a specific terminal in accordance to the spin state, i.e., the spin polarization and spin separation can both be simultaneously performed in such a structure. Meanwhile, the intra-dot Coulomb interaction affects greatly the spinning electron transport of the system where the intensity of Coulomb interaction in the quantum dot, which is coupled with the additional terminal, plays an important adjusting role in spinning electron transport.