Outdoor　microclimatic　conditions　strongly　affect　the　thermal　comfort　of　pedestrians.　A　transversal　field　survey　was　conducted　in　Guangzhou,　together　with　micrometeorological　measurements.　The　outdoor　physiological　equivalent　temperature　(PET)　varied　from　3　to　59　degrees　C.　Regression　lines　were　obtained　to　establish　correlations　of　the　mean　thermal　sensation　vote　(MTSV)　with　the　PET　bins　with　a　width　of　1　degrees　C.　Furthermore,　the　thermal　comfort　range　of　PET,　neutral　PET　(NPET),　and　preferred　PET　was　analyzed.　The　results　indicated　that,　for　the　young　people,　thermal　comfort　range　of　PET　spanned　from　19.2　to　24.6　degrees　C.　The　NPET　and　preferred　PET　significantly　differed　in　different　seasons.　The　NPET　was　higher　in　the　summer　than　that　in　the　winter　and　transitional　seasons.　However,　the　preferred　PET　of　the　summer　was　lower　than　that　of　the　winter.　The　PET　limits　of　different　thermal　stress　categories　were　also　confirmed,　which　differed　from　those　in　other　cities.　Thus,　the　impacts　of　adaptation　on　thermal　comfort　range　were　significant　for　people　in　outdoor　environment.