Incorporating　phase　change　material　(PCM)　into　building　envelops　is　an　effective　way　for　reducing　building　energy　consumption.　Compared　to　field　measurements,　numerical　modelling　offers　an　inexpensive　alternative　to　analyze　and　optimize　the　thermal　performance　of　PCM　envelops.　However,　it　is　always　assumed　that　there　is　no　difference　for　the　thermophysical　properties　correlation　of　PCM　between　the　charging　and　discharging　processes　in　the　current　numerical　studies.　The　assumption　isn＇t　consistent　with　the　real　thermophysical　properties　correlation　of　PCM,　which　will　increase　the　uncertainty　of　numerical　analysis.　To　validate　this　phenomenon,　a　PCM　was　introduced　and　its　thermophysical　properties　correlation　was　measured　in　both　charging　and　discharging　processes.　Then　the　PCM　was　pasted　on　the　inner　surface　of　a　ventilated　wall　in　a　solar　greenhouse,　and　its　numerical　model　was　established.　Finally,　the　thermophysical　properties　correlation　of　PCM　was　input　to　the　developed　model　with　nine　assumptions.　The　results　showed　that　there　was　a　difference　for　thermophysical　properties　correlation　of　PCM　between　the　charging　and　discharging　processes.　The　calculated　data　would　have　the　best　agreement　with　the　experiment,　if　the　thermophysical　properties　correlation　of　PCM　in　both　charging　and　discharging　processes　was　input　using　the　numerical　approximation.　The　thermophysical　properties　correlation　of　PCM　had　a　significant　influence　on　the　thermal　performance　of　PCM,　hollow　blocks　and　solid　blocks,　while　it　had　little　contribution　on　the　insulation　layer.