Abstract: It taking 3107 fully mechanized caving face with extra thick coal seam in Luzigou coal mine as background，the dynamic change features of surrounding rock stress of coal pillar side in the roadway during mining stage of 3107 working face was analyzed by detailed numerical simulation analysis，mining influence of surrounding rock was intensity，appearance mechanism of roadway intensely dynamic pressure was analyzed in theory，based on it，large depth pre-slicing releasing technique in roof of intensely dynamic roadway was put forward，and then mechanism was illustrated.After slicing，surrounding rock stress of roadway along goaf in advanced supporting section decreased obviously，the position of the peak value of lateral abutment pressure moved toward the middle part of working face，the peak value of advanced abutment pressure moved toward cutting direction of working face，and then surrounding rock stress state could be improved obviously，the results of numerical simulation and field measured showed that surrounding rock of roadway was stability after slicing，and roadway convergence decreasing，coal pressure relaxed alleviate.