Pd/CeO2　catalysts　with　flower-like　morphology　were　fabricated　via　an　ultrasonic-assisted　membrane　reduction　(UAMR)　and　hydrothermal　methods.　The　catalysts　were　physically　characterized　and　evaluated　for　three-way　catalytic　activities　versus　traditional　Pd/CeO2　catalysts.　Flower-like　Pd/CeO2　catalysts　exhibited　a　higher　catalytic　performance　and　better　thermal　stability　than　the　Pd/CeO2　prepared　by　conventional　impregnation.　The　flower-like　Pd/CeO2　catalysts　were　constructed　from　20-50　nm　thick　nanosheet　petals.　These　petals　were　in　turn　constructed　from　10　nm　CeO2　nanoparticles　that　self-assembled　into　the　flower-like　morphology　resulting　in　abundant　pores　in　all　directions.　The　Pd　nanoparticles　were　anchored　and　dispersed　on　both　the　interior　and　surface　of　the　pores　and　had　minimal　sintering.　When　these　catalysts　were　aged,　the　structure　and　morphology　of　the　catalysts　remained　unchanged　with　important　industrial　implications　for　this　new　type　of　material　including　improved　catalytic　performance　and　high　thermal　stability.　Regardless　of　the　Pd　loading,　both　the　fresh　and　aged　Pd/CeO2　catalysts　prepared　by　the　UAMR-hydrothermal　method　exhibited　better　performance　than　the　corresponding　samples　prepared　by　conventional　impregnation　means.