The method of using high energy laser to remove the winding foreign matter of transmission line has achieved good results.In this paper,five kinds of typical foreign materials of transmission line are taken as the research object,and the finite element simulation model is established to analy ze the temperature distribution and micro variation law of laser ablation foreign body.The laser ablation experimen t was carried out.The results show that the temperature from the center to the edge of the foreign body decreases g radually when the laser irradiates the foreign body.The high temperature part melts first,and the low temperature part accumulates heat to make the temperature rise to the melting point,forming a "V" shaped pit.In the process of laser heating foreign body,the development of circumferential and deep direction is simultaneous,and the devel opment speed of depth direction is faster than that of circumferential direction.When the laser power reaches 200W,most of the colored foreign bodies can be removed,and the bright white foreign bodies can also be removed. The efficiency of laser removing foreign matters is between 1mm/s and 2mm/s,and the efficiency of laser removi ng foreign matters is higher.The research results provide an important basis for the application of laser in the removal of foreign bodies wrapped in transmission lines.