Global　warming　and　urban　heat　island　effects　negatively　impact　the　development　of　urban　thermal　environments,　making　them　very　uncomfortable　to　live　in.　Green　space　plays　an　essential　role　in　controlling　and　improving　air　pollution,　regulating　the　microclimate,　and　enforcing　compliance　with　public　health　requirements.　Therefore,　this　study　explored　the　relationship　between　green　space　and　thermal　comfort　in　the　historical　neighborhood　of　Dazhalan　in　Beijing　through　questionnaires,　observational　interviews,　and　numerical　simulations.　The　current　situation　of　the　microclimate　environment　in　the　green　space　of　the　block　was　observed　first.　Then,　the　microclimate　environment　was　simulated　by　the　ENVI-met　5.6　software.　The　thermal　comfort　of　the　three　types　of　space,　such　as　enclosed　space,　strip　space,　and　corner　space,　was　also　evaluated　to　explore　the　coupling　relationship　between　different　green　space　elements　and　microclimate　evaluation　factors.　It　was　found　that　the　thermal　comfort　PET　had　a　positive　correlation　with　the　sky　openness　SVF.　The　green　space　morphology　was　quantitatively　measured,　and　it　was　found　that　the　thermal　comfort　PET　had　a　negative　correlation　with　the　three-dimensional　green　quantity　of　green　space.　The　paper　developed　managing　strategies　for　optimizing　the　layout　and　construction　mode　of　the　green　space.　The　ultimate　goal　was　to　rationally　match　the　greening　planting,　improve　the　pavement　of　the　underlying　surface　of　the　block,　and　optimize　the　design　of　the　internal　space　topography.