Ni nanoparticles formed on SrTiO3(001) and (110) surfaces are investigated from both horizontal and vertical directions by STM and TEM. Structures and morphologies of the nanoparticles were investigated, and their dependences of morphologies and interfacial structures on surface orientations were found out. Ni nanoparticles mostly possess the modified Wulff construction. While nanoparticles on SrTiO3(001) mostly have Ni {001} interfaces, those on SrTiO3(110) have either Ni {110} or Ni {111} interfaces.