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The effect of tensor force on the density dependence of nuclear symmetryenergy has been investigated within the framework of the Brueckner-Hartree-Fockapproach. It is shown that the tensor force manifests its effect via the tensor$^3SD_1$ channel. The density dependence of symmetry energy $E_{sym}$ turns outto be determined essentially by the tensor force from the $\pi$ meson and$\rho$ meson exchanges via the $^3SD_1$ coupled channel. Increasing thestrength of the tensor component due to the $\rho$-meson exchange tends toenhance the repulsion of the equation of state of symmetric nuclear matter andleads to reduction of symmetry energy. The present results confirm the dominantrole played by the tensor force in determining nuclear symmetry energy and itsdensity dependence within the microscopic BHF framework.

Effect of tensor force on density dependence of symmetry energy within the BHF Framework