Some　noclassical　properties　in　electromagnetic　field　are　investigated　for　the　interaction　of　two-modes　initially　taken　in　coherent-state　representation　with　the　three-level　Xi-type　atom,　such　as　squeezing　properties　and　violation　of　the　Cauchy-Schwartz　inequality.　The　enhancement　of　field　squeezing　is　found　by　selective　atomic　measurement.　The　Cauchy-Schwartz　inequality　is　violated　by　the　application　of　the　classical　field　followed　by　detection　in　excited　state.