Rb+:KTP　and　Cs+:KTP　crystals　have　been　grown　respectively　by　slow　cooling　method　in　KTP-K6　high　temperature　solutions　with　5mol%　Rb+　or　Cs+.　It　is　found　that　the　crystal　growth　habit　has　been　changed　by　the　doping.　The　distribution　coefficients　of　Rb+　or　Cs+　in　corresponding　growth　system　are　0.646　and　0.08　respectively.　The　lattice　parameters　a0　and　b0　of　doped　KTP　crystal　are　slightly　longer　than　those　of　pure　KTP　crystal.　By　the　doping　of　Rb+　or　Cs+,　the　conductivity　along　c-direction　of　KTP　crystal　decrease　obviously,　but　the　transmission　properties　of　KTP　crystal　in　wave　range　of　350-1100　nm　have　not　be　affected.