Abstract: Excavation face space effect of the circular roadway is analyzed based on the theory of excavation surface effect.The supporting characteristic of bolt supporting structure in coal roadway is studied.And the variation characteristics of release load in surrounding rock of roadway and supporting pressure in supporting structure are discussed under different radius and roadway driving speed to provide theoretical basis for choosing the appropriate supporting time.The results show that the radius of roadway has less effect on the release load in surrounding rock.The release load in surrounding rock shows slow increase after the first rapid increase and then basically remains unchanged. Roadway driving speed has great effect on release load in roadway surrounding rock, and load in surrounding rock releases faster along with the increase of driving speed.The corresponding supporting time should be in advance.The greater roadway radius is,the more gently virtual supporting pressure in surrounding rock changes;the radial supporting pressure decreases rapidly with the increase of roadway driving speed and the corresponding excavation time is shorter in critical point of supporting pressure.