The structures of Pb(ZrxTi1-x)O3/YBCO heterostructure with different thickness of PZT sublayer were investigated.The lattice parameter,c of YBCO layer is obtained to be c=11.686±0.001A.being of 0.2% larger than that of the bulk one.The lattice parameter,c of PZT layer is c=4.116±0.001A,indicating that the composition of the sample is Pb(Zr0.48Ti0.52)O3.The misorientations of YBCO/PZT sublayers were observed in the samples B and D.The effect of the crystalline quality of the STO substrate o the quality of the YBCO and PZT epitaxial fllms was discussed.