We　propose　a　new　approach　to　quantum　phase　gates　via　the　adiabatic　evolution.　The　conditional　phase　shift　is　neither　of　dynamical　nor　geometric　origin.　It　arises　from　the　adiabatic　evolution　of　the　dark　state　itself.　Taking　advantage　of　the　adiabatic　passage,　this　kind　of　quantum　logic　gates　is　robust　against　moderate　fluctuations　of　experimental　parameters.　In　comparison　with　the　geometric　phase　gates,　it　is　unnecessary　to　drive　the　system　to　undergo　a　desired　cyclic　evolution　to　obtain　a　desired　solid　angle.　Thus,　the　procedure　is　simplified,　and　the　fidelity　may　be　further　improved　since　the　errors　in　obtaining　the　required　solid　angle　are　avoided.　We　illustrate　such　a　kind　of　quantum　logic　gates　in　the　ion　trap　system.　The　idea　can　also　be　realized　in　other　systems,　opening　a　new　perspective　for　quantum　information　processing.　©　2005　The　American　Physical　Society.