BiFeO3　(BFO)/YBCO　heterostructures　are　fabricated　on　(001)-oriented　SrTiO3　substrates.　The　transport　properties　of　BFO/YBCO　heterostructures　with　Au　and　YBCO　top　electrode　are　investigated.　The　Au/BFO/YBCO　heterostructures　show　obvious　rectification　effect.　The　current　through　Au/BFO/YBCO　heterostructures　at　positive　bias　is　mainly　bulk-limited　space-charge-limited　current　(SCLC)　at　temperatures　from　15　K　to　280　K.　As　the　applied　voltage　on　Au　electrode　is　negative,　Au/BFO/YBCO　heterostructures　satisfy　the　interface-limited　Schottky　emission　at　temperatures　from　220　K　to　300　K,　instead　of　interface-limited　Fowler-Nordheim　tunneling　at　temperatures　from　15　K　to　80　K.　The　leakage　current　density　is　reduced　by　two　orders　of　magnitude　through　substituting　the　Au　electrode　by　YBCO　electrode.　The　transport　mechanism　in　YBCO/BFO/YBCO　heterostructures　also　changes　to　SCLC.　The　different　leakage　mechanisms　result　from　the　reduced　oxygen　vacancies　because　the　fabrication　of　YBCO　layer　increased　oxygen　concentration　in　BFO　films.　(C)　2015　Elsevier　B.V.　All　rights　reserved.