Abstract: With the mining expansion and the mining depth of Xiaoguanzhuang iron ore increasing,the pressure in the mining area increased, the impact between every mining area became increasingly deepened and the situation of deep mine got worse and worse.Original supporting can not meet the requirements of the stability of roadway.These resulted in subside and deformation of roadway,and severely impeded production. In this paper,for the characteristics of the weak rock in the mine area of high stress, with theoretical analysis and experimental comparison, we analysis the defect of original supporting and the mechanism in instability of roadway. In connection with the problem of original supporting,we improve the supporting technology of medium-and-long anchor from materials, processes, supporting parameters, etc. The application of new medium-and-long anchor in the Xiaoguanzhuang iron ore improved the effectiveness of supporting, improved the stress state of rock,reduce the waste of material,and increase the economic benefits greatly.