In this paper, a heavy rain process after a prolonged drought in Shangluo, Shaanxi on 1~3 June, 2000 has been analyzed, utilizing various observed and calculated meteorological data. The results show that the heavy rain process not only related to the circulation on large scale of the weaken East Asia trough and the strengthened and extended westward subtropical high over west Pacific etc, but also related to the local characters like strong lower-level-jet, shear line and straticification unstability. When the heavy rain weather occurred, the heavy rain is located in the area with the high energy tongue in the lower level, the center of vapor convergence, the convergence and ascending center in lower level, and the divergence at the upper level.