According to south wing the second level -850 m large section in pump house and power substation and broken surrounding rock in Jiulong Mine, whole section anchoring inforcement technology was conducted. Especially, total length of prestressed anchor cable combining comprehensive grouting support technology was employed to roadeay floor, instead of metal bottom beam and concrete arch over the bass drum, realizing floor anchor cable actively supporting. Strictly preventing stress breaking from the thinnest place, providing technical experience of large section and roadway supporting under soft and complex conditions.