In order to investigate the control effects on a cable structure based on blowing through uniformly dis? tributed porous surfaces，we conducted a series of wind tunnel tests. The measurements of wake flow fields of the cable structure under the uncontrolled and controlled cases with Reynolds number Re 1.0×104 were achieved by a PIV system. Instantaneous and time-averaged flow characteristics was analyzed，and proper orthogonal decomposi? tion（POD）and dynamic mode decomposition（DMD）were utilized to analyze step-down modal characteristics. The non-dimensional control parameter in the blowing control was the equivalent blowing coefficient，CQ. The experimen? tal results show that with the increase of CQ，POD modal energy distributions tend to be uniform，dimensions of co? herent structures in the global flow fields are transformed to be homogeneous and the dominance of the first two POD modes is restrained. The wake vortex shedding frequency is changed and interactions between separated shear-layers are restricted. DMD modal eigenvalues are changed and spectral distributions of mode amplitudes shifted. Further? more，the recirculation region dimension in the wake is enlarged and the turbulence kinetic energy and Reynolds shear stress are significantly weakened.