Inthispaper,thesqueezingeffectsofalightfieldintheT CmodelisstudiedbymeansofthequantumtheoryintheCounter Rotating Wave Approximation (C RWA) .Ithasbeenshownthat:thelittleindentationwhichrepresentsthequantum
noiseofthesystemappearsintheevolutioncurvesofQundertheC RWA ;thequantumnoisewhichiscausedbyvirtualphotonfieldgraduallybecomesweakwhenωincreases;thequantumnoiseincreaseswhen nincreases;thevirtualphotonprocesscanstrengthenthesqueezingeffectobviously .Besides,thedependenceoftheatom fieldcouplingconstantλandtheatom atomcouplingconstantgonthesqueezingeffectsofthefieldisobservedinourresults.