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The coplanar waveguide(CPW)structure can support a quasi-TEM (Transverse Electromagnetic)mode of low frequency microwave propagation;meanwhile the Lorentz force could be induced by electric and magnetic fields in the cross section.However,the transmission characters of CPW show deeply influence by structure,material,transmission frequency as well as the surrounding medium parameters.The numerical simulation method has been used in this paper to investigate the distributions of electric fields;magnetic fields and Lorentz force around the CPW,immersed in the flow field with vary bulk conductivity.