Abstract: The character of upper/lower PV are analyzed based on PV anomaly with the genesis and development of cyclone, with results that low-level PV anomaly (LPVA), which is isolated from upper PV anomaly and has a leading/simultaneous current relative to cyclone, will grow upward, join with upper level downward PV anomaly, form PV anomaly column (PVAC) under available conditions. Thus the conclusion is obtains that the forming of PVAC is a remarkable symbol of cyclogenesis. Further study shows that diabetic heating during a torrential rain period in the South of Changjiang River is mainly produced by condensation latent heat from precipitation and the appearance of maximum heating level brings an increased PV beneath it, which, accelerating the development of the cyclone, is another important cause of rising and developing of LPVA.