The influence of graphite content and the sample thickness on gypsum-based composites 'absorbing properties as well as the influence of graphite contents on mechanical properties were studied by testing the absorbing properties of the samples at the range of 2-18 GHz and mechanical properties via modern testing techniques. The research shows that graphite-gypsum composites at the range of 2-18 GHz have good absorbing properties. The samples filled with 25wt% graphite have a best absorbing property when the ...