Under　the　Jaynes-Cummings　model,　the　evolution　of　nonclassical　properties　of　two　cavity　modes　is　discussed,　such　as　squeezing,　sub-Poissonian　statistics　and　violations　of　Cauchy-Schwarz　inequalities　and　Bell　inequalities　are　discussed.　The　two　cavity　modes　are　initially　in　pair　coherent　states,　each　mode　interacts　with　two　two-level　atoms　resonantly.　Numerical　simulation　results　show　that　some　nonclassical　properties　can　be　enhanced　after　resonant　interaction　between　the　atoms　and　the　cavity　and　the　performance　of　a　selective　atomic　measurement.　Moreover,　after　atom-cavity　interaction,　a　resonant　classical　microwave　field　is　applied　to　the　atoms,　which　performs　a　unitary　transformation　on　the　atomic　states,　a　selective　measurement　is　performed　to　the　atoms　after　selecting　transform　parameters　the　two-mode　squeezing　can　be　somehow　enhanced.