The dynamics of cold atoms interacting with external laser fields is investigated. For multilevel atoms interacting with external laser fields, e.g., [EQUATION]Li, two-fold degenerate dressed states are obtained under appropriate parameters configuration, which may be defined as spin-up and spin-down in analogy with the spin-1/2 charged system. Further analysis shows that different spin states will feel spin-dependent gauge fields. When the cold atoms move in spatially varying laser fields, the effective spin-dependent gauge potential will lead to spin Hall effects as well as observable spin Hall currents.