Cement　mortar　shows　piezoresistivity　after　being　mixed　with　small　amount　of　graphite,　thus　the　resistivity　of　the　material　will　changed　with　stress.　In　this　study,　specimens　embedded　double　electrodes　which　made　of　cement　based　material　with　small　amount　of　graphite　(3　wt.%　of　cement)　are　used　in　the　experiments　of　one-time　loading　and　cyclic　loading,　and　the　relative　resistivity　are　measured　by　a　series　connected　AC　circuit.　The　results　show　that　the　specimens＇　piezoresistivity　goes　down　while　the　stress　increases,　and　different　curves　of　piezoresistivity　can　be　observed　in　experiments　with　different　loading　methods.　The　relative　resistivities　of　the　specimen　show　a　similar　change　as　strain.　©　(2011)　Trans　Tech　Publications.