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We investigate the linear and nonlinear transport through a single levelquantum dot connected to two ferromagnetic leads in Kondo regime, using theslave-boson mean field approach for finite on-site Coulomb repulsion. We findthat for antiparallel alignment of the spin orientations in the leads, a singlezero-bias Kondo peak always appears in the voltage-dependent differentialconductance with peak height going down to zero as the polarization grows toP=1. For parallel configuration, with increasing polarization from zero, theKondo peak descends and greatly widens by the appearance of shoulders, andfinally splits into two peaks on both sides of the bias voltage around $P\sim0.7$ until disappears at even larger polarization strength. At any spinorientation angle $\theta$, the linear conductance generally drops with growingpolarization strength. For a given finite polarization, the minimum linearconductance always appears at $\theta=\pi$.

Spin-Polarized Transport Through a Quantum Dot Coupled to Ferromagnetic Leads: Kondo Correlation Effect