The　morphology　of　the　active　layer　is　vital　for　the　device　performance　of　organic　electronics.　However,　most　research　is　primarily　focused　on　the　active　layer　prepared　from　the　spin　coating　method,　which　is　not　suitable　for　large　area　manufacturing.　The　inkjet　printing　technique　has　been　widely　studied　in　the　field　of　organic　electronics　due　to　its　advantages　of　scalability,　patternability,　and　affordability.　Nevertheless,　morphological　changes　in　the　active　layer　during　inkjet　printing　have　received　little　attention.　Herein,　for　the　first　time,　the　influence　of　inkjet　printing　parameters　on　the　bulk　heterojunction　morphology　and　device　performance　of　organic　photovoltaics　(OPVs)　was　systematically　studied.　The　crystal　sizes　decreased　as　the　inkjet　printing　speed　or　substrate　temperature　increased,　which　was　vital　for　bimolecular　recombination　and　carrier　transport.　Moreover,　the　π-π　stacking　distance　decreased　as　the　inkjet　printing　speed　increased,　which　is　beneficial　to　charge　transport,　resulting　in　improved　device　performance.　However,　an　uneven　film　was　formed　when　the　substrate　temperature　increased,　degrading　the　device　performance.　It　is　demonstrated　that　the　control　of　inkjet　printing　parameters　can　effectively　improve　the　morphology　of　active　layer,　paving　guides　for　high-efficiency　large-area　production　of　OPVs　and　other　organic　electronics.　©　2021　IOP　Publishing　Ltd.