The weather environments and radar echo features of thunderstorm occu rred on April 27th and 28th 2008 in Lhasa are analyzed by using Doppler radar da ta, lightning data and ECMWF data and conventional meteorological data and so on . The result showed that this thunderstorm in Lhasa was engendered by the cold a ir which came southward from Ural and strengthened the development of the unstab le level and turbulence in Lhasa. Radial velocity map and VAD wind profiler both showed that there were obviously the lowlevel warm advection structure, low le vel jet and vertical wind shears. The interaction between the γmesoscale cycl on ic vortex disturbance and the environment vertical wind shears led to the develo pments of thunderstorm cloud and rising of echo top, of which the height of ech o of 40 dBz reached to 7 km. The value of CAPE, the γmesoscale cyclonic vort ex disturbance, vertical wind shears and lowlevel warm advection structure are good indices to the forecasting and warning of Lhasa th understorm. This paper gives the notion and the emphasis of the forecasting of t hunderstorm in Lhasa.