In　view　of　the　problem　that　the　temperature　difference　of　the　multi-channel　flat　tube　single-stage　heat　storage　device　gradually　decreases　and　the　heat　transfer　is　uneven　during　the　charging　and　discharging　process,　this　paper　proposes　a　multi-channel　flat　tube　cascade　phase　change　heat　storage　system　which　includes　two-stage　devices,　52　#　paraffin　and　lauric　acid　as　phase　change　materials(PCM)filled　in　the　cascade　heat　storage　devices.　Water　was　used　as　heat　exchange　fluid,　charging　and　discharging　characteristics　for　the　cascade　phase　change　heat　storage　system　under　different　inlet　temperatures　and　different　flow　rates　were　investigated.　The　experimental　result　showed　that　compared　with　flow　rate,　inlet　temperature　of　the　heat　exchange　fluid　has　a　greater　impact　on　the　heat　transfer　performance　of　the　cascade　heat　storage　system.　When　the　inlet　temperature　of　the　heat　exchange　fluid　increases(decreases)or　the　flow　of　the　heat　exchange　fluid　increases(decreases),　the　charging(discharging)time　of　the　cascade　heat　storage　system　decreases,　the　charging(discharging)power　increases.　©　2024　Science　Press.　All　rights　reserved.