Abstract: In order to improve the safety of underground fully mechanized mining with coal pillarless， the geological conditions of extra-thick hard roof in Shaping Coal Industry are taken as the engineering veri‐ fication object，and the geological area division is carried out after the exploration of the geological condi‐ tions of the working face. Combined with the underground geological characteristics，the underground blast‐ ing pre-splitting scheme，the constant resistance large deformation anchor cable support scheme and the un‐ derground gangue retaining support scheme are analyzed in depth，and a set of relatively complete non-pil‐ lar mining technology scheme under the extra-thick hard roof is formed. Through the underground industrial test and monitoring，the application reliability of the scheme is proved. According to the practical applica‐ tion in underground coal mine，it is shown that the three-zone pre-splitting blasting technology can reduce the hanging length of the roof during the operation and ensure the safety of the retained roadway. For under‐ ground support，it is necessary to combine different geological conditions to set up advanced support，post�frame support，temporary support and stable support respectively. Through different support schemes，the support efficiency and support economy of underground roadway can be improved. The fully mechanized mining technology without coal pillar under the underground hard roof can significantly shorten the pressure step distance and reduce the pressure intensity，which has a strong guiding effect for the efficient and safe mining of coal under similar geological conditions.

Key words: hard roof, fully mechanized mining with coal pillarless, geological zoning, mining pres‐ sure monitoring