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Assuming the Hubble parameter is a continuous and differentiable function ofcomoving time, we investigate necessary conditions for quintessence to phantomphase transition in quintom model. For power-law and exponential potentialexamples, we study the behavior of dynamical dark energy fields and Hubbleparameter near the transition time, and show that the phantom-divide-line w=-1is crossed in these models.Comment: LaTeX, 19 pages, four figures, some minor changes in Introduction,  two figures added and the references updated, accepted for publication in  Phys. Rev.

Transition from quintessence to the phantom phase in the quintom model