This　paper　introduced　the　experimental　study　of　a　duct　heat　store　system.　In　one　storage　cycle,　charge　period,　storage　period　and　discharge　period　were　investigated　respectively,　and　soil　temperatures　and　water　contents　in　the　store　center,　at　the　edge　of　the　store　and　at　different　distances　from　the　store,　were　measured.　The　results　showed　that　heat　loss　in　the　charge　process　was　the　largest　in　one　cycle;　Temperature　increase　of　the　store　caused　significant　variation　of　the　water　contents　of　the　soil:　the　water　content　on　the　store　boundary　was　the　highest,　and　from　the　store　boundary　along　to　either　the　center　or　the　outside　of　the　store,　the　water　content　decreased　gradually;　The　water　content　of　the　store　center　was　only　0.12%.　Discharge　efficiency　reached　about　43%　after　two　months　upon　the　end　of　the　charge　period.　It　could　be　concluded　that　the　solar　seasonal　storage　system　with　borehole　heat　exchangers　is　feasible,　and　it　has　good　prospect　in　the　future.