This article analyzes the establishment of gear through the UG model into finite element analysis software ANSYS finite element analysis process of gear strength.UG analog gear through the process of doing so pure rolling rolling across rough cutter to achieve the curve of the involute gear alveolar formation.Through a series of rotating,mirroring similar operations such as generating the size of the two gears meshing.ANSYS finite element analysis software through the gears and gear root gravity analysis of contact stress calculations on two small gear contact stress distribution maps.Through theoretical analysis is verified by comparing curve advantage of gear in use