Abstract: Baizhu Phosphate is the rare slowly inclined large and thick phosphorus ore，which lagerst thickness of the ore beds is nearly 25 meters.Combined with the complex geological conditions in Baizhu phosphate,especially the characteristics of roof structure breaking and joint development.Analogy with the mining method of similar mines,the “combined support method of anchor bolt and anchor rope” which is developed independently for the high suspending roof and large exposed area about goaf treatment of gently inclined thick and large phosphorus ore-bodies.In the actual application process,firstly，the roof cutting is conducted in Ph3 drift in the top of ore bed，the roof cutting used the SandvikDD310-40 drilling jumbo punching and charge explosion,and then the roof classification is done by adopting the roof classification management technology,finally adopted the scheme that is corresponding to the bolt and anchor support for the roof,then anchor cable strengthening roof by the classification of roof structure.After many years of experiments，a set of methods suitable for the management of phosphate rock roof under complex geological conditions is explored.

Key words: Complicated geological condition, Thick and large phosphorus ore-body, Goaf roof, Combined support