Abstract：Research purposes: The unevenness of Overhead Rigid Suspension arises the bad vibration between the pan-tograph and rigid suspension，which can spoil the current collection and endanger the running safety. The study is beginning in our country ， so the analysis on unevenness of Overhead Rigid Suspension is necessary.
Research methods: The numerical simulation analysis，pantograph and catenary numeration model are used to uneven-ness of Overhead Rigid Suspension.
Research results: The current collection performance depends on its pantograph compliance characteristics and unevenness of its contact surface.
Research Conclusions: The unevenness of Overhead Rigid Suspension is the basis of study on vibration of pantograph with rigid suspension，reducing the unevenness，and the current collection quality will be promoted.
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2007, Vol. 24 
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