(Bi0.5Na0.5)TiO3　based　ferroelectric　lead-free　thin　films　have　great　potential　for　modern　micro-devices.　However,　the　multicomponent　feature　and　volatile　nature　of　Bi/Na　makes　the　achievement　of　high　quality　films　challenging.　In　this　work,　the　morphotropic　phase　boundary　composition,　0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3　thin　films　were　successfully　prepared　by　CSD　method.　Dense　films　with　low　dielectric　loss　and　low　leakage　current　density　were　obtained.　A　well-defined　polarization　hysteresis　loop　with　a　high　remnant　polarization　was　observed　in　the　thin　films.　Moreover,　the　polarization　behavior　of　the　film　at　original　state,　under　electric　field　and　upon　heating　was　investigated　by　PFM.　A　self-polarization　and　asymmetric　domain　switching　behavior　were　observed.　High　temperature　induced　depolarization　and　the　self-polarization　recovered　upon　cooling.　The　thin　films　with　good　quality　show　a　promising　potential　for　the　application　in　electrical　devices,　and　the　in-depth　investigation　of　the　polarization　behavior　improves　the　understanding　of　ferroelectric　and　piezoelectric　properties　of　thin　films.　©　2020　Elsevier　Ltd