Research purposes: The Harbin—Dalian Passenger Dedicated Line is situated in the northeast of China with cold winter night and foggy and snowy weather．The maintenance and repare will be conducted in night for the line，but the catenary will ice up because there is seldom train running on the line in night．In order to ensure the train operation safely and make the catenary in perfect status，this paper analyzes the deicing and anti—icing and offers the measures for deicing and anti—icing for catenary．
Research conclusions: According to the icing situation，the alarm induction device can give out the deicing message in time for timely deicing，avoiding or reducing the ice disaster．The short circuit method for the catenay deicing is simple and feasible．The catenary icing can be effectively avoided，the unsafe train running due to the catenary icing can be reduced，the weals of pantograph and catenary due to the catenary icing can be reduced and the passenger comfort can be improved by coating the materials for deicing on catenary，SO the perfect economic benefits can be obtained by deicing and anti—icing for the catenary．
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