Due to the phasic and continuous rheology of soft rock

failure of surrounding rock and supports of soft rock roadway usually happened. Based on the analysis of interaction effect between roof and support and bottom

the support principle of yielding support with whole section and O-shape control is proposed for the large deformation roadway in deep soft rock. Firstly

the roadway in deep soft rock should be supported with whole section and high strength to control initial deformation. Meanwhile

effective measures releasing pressure of surrounding rock with whole section properly

surrounding rock of roadway would be controlled to good stability

making sure that the soft rock roadway could be controlled coordinately and consistently. Through the mechanical model

relations of plastic zone and surface displacement of the soft rock roadway with supporting force are calculated; the relationship between surrounding rock deformation and support force is negative. Engineering practice showed that the large deformation of roadway in deep soft rock could be controlled efficiently with this support principle. Research results have a good value to similar engineering.