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A quasi-static wear model for helical gears is proposed based on finite element method and Archard’s formula to investigate the wear characteristics of tooth surface in real operation conditions. The numerical simulation reveals that thewear depth distributes unevenly along the tooth lead and varies along the tooth profile. The surface wear depth claims its minimal value at the pitch circle and reaches its maximal value near the tooth root of the pinion. The effects of misalignment on wear depth are further investigated toprovide useful information for gear designers. The numerical simulation reveals that the vertical misalignment is more influential than the parallelmisalignment on the gear wear depth.Therefore,to eliminate the negative effects of misalignment,the misalignment should be strictly controlled.