The　water　absorption　and　desorption　process　of　ceramsites　with　different　prewetting　degree　embedded　in　lightweight　aggregate　concrete　were　monitored　by　a　U-tube　micro-pressure　measurement　device.　The　interfacial　structure　between　ceramsites　and　hardened　cement　paste　in　lightweight　aggregate　concrete　was　scanned　by　SEM.　By　a　new-ring　restrained　shrinkage　equipment,　the　tensile　creep　characteristics　of　lightweight　aggregate　concrete　was　also　investigated.　The　study　reveals　that　with　the　increase　of　ceramsite　prewetting　degree　the　ability　of　water　absorption　declines　and　the　ability　of　water　desorption　increases　for　ceramsites　embedded　in　lightweight　aggregate　concrete;　the　interfacial　transition　zone　(ITZ)　between　ceramsites　and　hardened　cement　paste　becomes　denser,　and　the　tensile　creep　of　lightweight　aggregate　concrete　declines.