Kick-out　pulse　is　the　key　signal　in　Nose-to-Nose　calibration　procedure.　It　is　the　foundation　of　the　theory.　So,　study　kick-out　pulse　caught　people＇s　high　attentions.　A　new　method　to　analysis　the　kick-out　pulse　was　promoted　in　this　paper.　The　excitation　signal　waveform　which　generates　kick-out　pulse　was　found　based　on　the　analysis　of　the　unbalance　sampler　circuit.　The　conclusion　is　that　it　is　the　leakage　of　the　strobe　pulse　that　generates　kick-out　pulse　on　the　input　connector　when　the　offset　voltage　is　nonzero.　Compared　with　S　parameters　xanalysis,　it　is　simple　to　undestand　and　the　concept　is　clea.　Simulations　confirmed　the　analysis.