In　this　paper,　we　study　the　nonclassical　properties　of　the　electromagnetic　field　resulting　from　the　interaction　of　a　three-level　-type　atom　with　a　two-mode　field　initially　in　the　coherent　state,　such　as　squeezing　properties　and　sub-Poisson　statistics.　We　show　that　the　squeezing　can　be　enhanced　by　selective　atomic　measurement.　©　2007　Chin.　Phys.　Soc.　and　IOP　Publishing　Ltd.