The low conductivity of carbon fiber composite generated clutter signals which have a bad effect on the communication equipment mounted on carbon fiber composites of helicopter.In order to improve the conductivity of connection structure of carbon composite helicopter,the composite beam of helicopter was taken as the research object.Through increasing the connection performance between the communication equipment interfaces and the composite beam structure and the conductivity of helicopter tail beam itself,the conductivity of carbon fiber composite was improved efficiently.The results from several experiments and verifications of installation show that the conductive material of carbon fiber composite should be continuous,and there is a significant linear correlation between the length of the conductive material and the resistance value.The pretreatment on the communication equipment interfaces can increase the conductivity of carbon fiber composites.The steps of the pretreatment are as follows:(1)Copper meshes should be placed along the conductive direction continuously to keep the continuity of conductive structure；（2）During the conductive connection with other parts，the copper sheet used for connection need to be pretreated and welded with the copper mesh to obtain a stable conductive interface；（3）The conductive effect is related to the length of conductive path and the quality of pretreatment，which is basically linear relationship.