We　have　explored　that　the　phase　transition　of　colloidal　perovskite　CsPbI3　quantum　dot　(QD)　during　synthesis　and　purification　processes　are　mainly　induced　by　the　increase　of　particle　size　(crystal　growth).　To　stabilize　the　cubic　structure,　the　metal　cations　Mn2+　and　Zn2+　with　smaller　ion　radius　than　that　of　Pb2+　were　doped　into　the　QD.　These　not　only　caused　the　lattice　constriction　and　increased　the　Goldschmidt　tolerance　factor　of　perovskite　structure,　but　also　enhanced　the　Pb-I　binding　energy,　all　of　which　improve　the　tolerance　of　phase　transition　induced　by　the　growth　of　crystal　size　during　purification　process.　Besides,　the　doped　QD　solutions　and　films　show　fewer　defects　and　lower　trap　density　than　those　of　the　undoped　samples,　owing　to　the　alleviation　of　lattice　distortion.　The　results　reveal　that　the　Zn-doped　and　Mn-doped　QD　solar　cells　display　power　conversion　efficiency　of　13.5%　and　12.0%,　respectively,　much　higher　than　that　of　the　control　device.