Low　temperature　stress　is　an　important　factor　for　turf　growth　in　northern　hemisphere　district　with　high　latitude.　In　order　to　prolong　turf　growing　season　in　winter,　thermosyphon　temperature　units　with　shallow　geothermal　source　were　developed　and　tested　in　a　water　park.　The　relations　between　ambient　temperature,　depth,　material,　structure,　and　soil　temperature,　roots　temperature　were　studied　experimentally.　The　results　indicated　that　both　underground　soil　temperature　and　roots　temperature　almost　remained　constant　with　hourly　ambient　temperature.　The　soil　temperature　increased　with　depth.　The　roots　temperature　of　copper　units　was　higher　than　that　of　steel　units,　and　the　temperature　difference　could　reach　2°C　at　most.　The　roots　temperature　of　structure　I　units　was　higher　than　that　of　structure　II.　The　impact　of　material　on　roots　temperature　variation　became　negligible　with　increasing　depth.