2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/106891In this paper I give a brief review on the recently proposed new scenario of dark energy model dubbed $Quintom$. Quintom describes the dynamical dark energy models where the equation of state getting across the cosmological constant boundary during evolutions. I discuss some aspects on the quintom model buildings and the observational consequences.4 pages, 1 figure. Contribution to proceedings of the workshop "The 15th Workshop on General Relativity and Gravitation" (Japan, November 2005)Astrophysicstext