Nb　doped　YBa2Cu3O7-x(YBCO)　film　was　fabricated　by　metal　organic　deposition　(MOD)　method.　BYNO　thin　film　composed　of　Nb　element　was　obtained　with　the　size　ranged　from　20-30　nm.　It　is　indicated　that　the　epitaxial　and　random　oriented　BYNO　nanoparticles　were　coexisted　in　YBCO　film　and　mainly　shows　random　orientation.　Strengthening　of　nano　strains　can　be　attributed　towards　the　stacking　fault　parallel　to　the　film　and　the　lattice　distortion　around　the　BYNO　nanoparticles　inside　the　thin　film.　As　the　random　fraction　of　BYNO　increasing,　the　nanostrain　within　nanocomposites　was　strengthened.　The　nanostrain　increases　the　magnetic　flux　pinning　ability　of　the　film,　thereby　improving　the　superconducting　properties　of　the　film　under　high　magnetic　field.