Auditory　steady-state　response　(ASSR)　is　a　kind　of　signal　which　is　phase-locked　to　the　stimulus　onset.　Consequently,　the　methods　of　detecting　ASSR　are　generally　based　on　the　feature　of　phase-locking.　In　this　paper,　ASSR　in　40　and　90　Hz　were　recorded　from　13　subjects.　The　phase　values　were　calculated　while　the　subjects　attended　to　the　tones.　And　it　was　found　that　besides　S7,　for　each　frequency,　the　phase　of　ASSR　were　fairly　constant　across　all　12　subjects.　For　examples,　the　phase　of　ASSR　responding　to　40　Hz　was　mainly　distributed　around　3/4pi.　Based　on　the　results,　the　method　of　V　test　was　introduced　in　this　paper.　By　comparing　the　results　obtained　by　V　test　and　Rayleigh　test,　we　found　that　V　test　is　a　more　effective　method　for　detecting　ASSR.　©　Springer-Verlag　Berlin　Heidelberg　2014.