More　attention　was　paid　to　the　fact　that　columnar　defects　generated　by　introducing　nano-particles　into　YBCO　films　can　improve　the　in-field　superconducting　properties　of　YBCO　as　pinning　centers.　Epitaxial　YBCO　films　with　self-assembled　Yttrium-stabilized　Zirconia　(YSZ)　nano-particles　have　been　successfully　prepared　by　TFA-MOD　based　on　different　solutions　and　the　effect　of　nano-particle　dopants　on　the　field　properties　of　YBCO　films　was　investigated　by　analyzing　the　results　obtained　by　PPMS　according　to　the　Bean　Model.　The　critical　current　densities　(J(c))　of　YBCO　films　with　YSZ　nano-particle　were　found　to　be　improved　with　respect　to　pure　YBCO　films　in　range　of　0-5　T.　The　J(c)　value　of　YBCO　film　with　YSZ　dopant　was　0.2　MA/cm(2)　at　50　K　and　4　T　field,　which　is　4　times　higher　than　that　of　pure　YBCO　film.　Furthermore,　an　optimized　property　was　observed　for　YBCO　films　doped　by　6　mol.%　YSZ　nano-particle　shown　by　the　dependence　relationship　between　J(c)　value　and　field　for　YBCO　films　with　different　amount　of　YSZ　dopants.