Based on the NCEP/NCAR reanalysis daily data from 1983 to 2012,this paper investigates the climatological mean characteristics of circulation field when South Asian high(SAH) moves on the Tibetan Plateau(TP) from May to June and its relation to the diabatic heating over TP and its adjacent areas.Results show that SAH moves northwestward from the northern Indo-China Peninsula(ICP) and completely moves on TP in the 33rd pentad,which is consistent with the time when south of TP becomes the main heat source center in southern Asia,and the vertically integrated visible heat source <Q₁> in south of TP increases more faster than that in the south Bay of Bengal(BOB) to the ICP,which may be one of reasons leading to SAH moving on TP.Meanwhile,this paper analyzes the relationship between heating fields and streamline fields by using the simplified complete vertical vorticity equation.It is found that the relative vorticity advection and the geostrophic vorticity advection are conducive to SAH moving westward,and the vertical change of diabatic heating is favorable to SAH moving northward,which makes SAH moving northwestward and on TP.