The third typhoon ″Durian″ (0103) causing disaster in Guangxi is synthetically analyzed.The results show that the favorable synoptic situation and dynamical struture are indispensable conditions for producing typhoon heavy rain in Guangxi,such as the strong positive vorticity and convergence ascending motion,the convective instability in middle lower troposphere,the west/east wind jets and the strong vapor transfer. The typhoon ″Durian″ always moved along the high energy axis,the heavy rain core lay near the tip of high energy and unsteadiness tongue,and is consistent with the center of positive vorticity.