Finite element software ANSYS7.0 is employed to analyze the interlaminar shearing stresses of C_f/epoxy composite tubes under axial loading. The tubes are fabricated by the flexible expandable mould process. Analysis results show that asymmetry plies increase the hoop interlaminar shearing stresses by 0.43～1.14 times，but no effects on axial interlaminar stresses. The ratio of axial plies to hoop plies plays an important role on the hoop and axial interlaminar shearing stresses, which the stresses reach to a minimum when it's withn the range of 7∶3～4∶1.