Abstract: Through comparing and analyzing network deployment of 5G non-standalone (NSA) and standalone (SA) as well as their advantages and disadvantages, and combining with current status of 4G "one network one base-station" generally applied in coal mine underground, a 4G-5G fusion network architecture of coal mine underground based on NSA is proposed which uses 4G network to realize voice and dispatch functions and 5G network to expand other intelligent applications, so as to minimize investment. 5G network transmission modes in coal mine underground are researched, and three front-haul transmission networking schemes of 5G hosted network are focused on as well as their applicable scenes: Fibre-optical direct-connection scheme is applicable for scenes including robot inspection in underground pump house, substation and other places, virtual reality(VR)/augmented reality(AR) training, unattended working face; Passive wavelength division multiplexing scheme is applicable for underground scenes with simple network deployment and high independent maintainability; Active optical transport network scheme is applicable for different scenes flexibly. Four application scenes of 5G network slice in coal mine underground are probed on, which are intelligent inspection robot, environment monitoring and security protection, VR/AR smart coal mine and driverless vehicle, and application modes of 5G networking architecture in different scenes are analyzed.