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In order to study the method of suppressing far-end crosstalk, this paper studied electromagnetic simulation of the far-end crosstalk between microstrip lines by using Ansoft HFSS. The results show that the far-end crosstalk is obviously reduced with guard lines between microstrip lines and media layer on the top of microstrip lines. In the certain frequency range, it is an effective way to suppress far-end crosstalk in large scale by increasing the length and number of metallic sheets; the method of selecting large relative permittivity and thickness of media layer can also reduce the effect of far-end crosstalk. [ABSTRACT FROM AUTHOR]