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We study the spin dynamics in Fe|MgO|Fe tunnel junction with the dynamical exchange coupling by coupled Landau-Lifshitz-Gilbert equations. The effects of spin pumping on the spin dynamics are investigated in detail. It is observed that the spin pumping can stabilize a quasi-antiparallel state rather than a quasi-parallel one. More interestingly, our work suggests that the spin pumping torque can efficiently modulate the magnetization, similar to the thermal-bias-driven and electricbias-driven spin torques., Comment: We find that our paper have some porblems which need to be solved and further studied. Particularly, as experiment reported, the spin pumping effect is not strong in the magnetic tunnel junction, not consistent with our previous predictions